DOCSLIB.ORG

Comparison on Natural Diets Dietary Composition And

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Comparison on Natural Diets Dietary Composition And Journal of Sustainability Science and Management eISSN: 2672-7226 Volume 14 Number 4, August 2019: 25-37 © Penerbit UMT COMPARISON ON NATURAL DIETS DIETARY COMPOSITION AND FOREGUT FULLNESS BETWEEN SEXES OF CRENATE SWIMMING CRAB, Thalamita crenata (RÜPPELL, 1830) FROM SETIU WETLANDS, TERENGGANU COASTAL WATERS, MALAYSIA ADNAN AMIN-SAFWAN1, AZMAN NURAZIRA2, KHAIRUL SALLEH SYAFIQAH-NURAIN2, MOHD PAUZI MARDHIYYAH1, HARMAN MUHD-FAROUK1,3, HAIRUL HAFIZ MAHSOL1,4, MOHAMAD SYAHNON1 AND MHD IKHWANUDDIN*1 1Institute of Tropical Aquaculture and Fisheries Reseach, 2 Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu, Malaysia. 3Fisheries Research Institute Batu Maung, Department of Fisheries, Batu Maung, Pulau Pinang, Malaysia. 4Institute of Tropical Biology and Conservation, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia. *Corresponding author: [email protected] Abstract: This study describes the natural diets of the crenate swimming crab, Thalamita crenata through observation on parameters for dietary composition between different sexes. A total of 30 pairs of T. crenata males and females were sampled from Setiu Wetlands, Terengganu, Malaysia. A significant difference ρ( < 0.001) was observed between body weight and the sex of T. crenata. Foregut fullness analysis revealed that males have a higher percentage of index score 4 than females (36.66% and 26.67%, respectively). A total of 12 different dietary items were identified in both sexes of T. crenata. Fish (male: 18.8%; female: 16.7%) and bivalve (male: 14.6%; female: 16.7%) were recorded as the most abundant in foregut content of both sexes of T. crenata. Gut content analysis reveals that T. crenata is a generalistic predator, cannibalistic and omnivorous as its diet is mainly composed of fishes, bivalves, slow-moving crustaceans and plants like seagrass and thus indicates their main food source. Overall, males possessed higher mean frequency of BW compared to females with 78.47 ± 17.66 g and 55.86 ± 14.48 g, respectively. No significant difference of food preferences was noted between the different genders and between the size of the crab (BW) with the mean fullness and dietary composition of T. crenata. This finding helps in understanding the dietary composition of different sexes ofT. crenata and thus can be a reference focusing on this species population dynamics and ecology study mainly for management purposes and artificial diet development for the near future. Keywords: Body weight, crenate swimming crab, dietary composition, foregut fullness, Thalamita crenata. Introduction 2011; Amin-Safwan et al., 2016) and other Crenate swimming crab, Thalamita crenata swimming crabs of the Indo-Pacific region also known as rocky spiny crab (Songrak et al., (Cannicci et al., 1996). T. crenata can be found 2009) is commonly found in mangrove creeks in South Africa, Madagascar, the Red Sea, the (Muhd-Farouk et al., 2017) and shallow waters Persian Gulf, India, China, Indonesia, Malaysia, of the Indo-Pacific region (Cannicci et al., Singapore, Korea, Japan, Australia, Tuamotu, 1996). These crabs inhabit the rocky and muddy Tonga, Hawaii and French Polynesia (Wee intertidal platform in front of the Sonneratia- & Ng, 1995). This species is fished mainly in fringe and swim in the swamps during their the Southeast and East Asian countries and are activity period (Vezzosi et al., 1995; Songrak frequently caught by trawlers, traps, seines and et al., 2009; Muhd-Farouk et al., 2017). Such nets. Collapsible traps are also widely used by behaviour was also observed in mud crab, genus fisherman for collecting mud crab, especially Scylla (Hill, 1979; Ikhwanuddin et al., 2010; in Malaysia (FAO, 2001). Although T. crenata Adnan Amin-Safwan et al. 26 is one of the most common and widespread and Mckillup (1996) have investigated on T. swimming crab species, little research has been crenata natural diets and feeding habits, while, done on this species or others within the genus Songrak et al. (2009) focused on fishery biology (Vezzosi et al., 1995), mainly due to lower of T. crenata. Susanto and Irnawati (2014) and market value as it is small in size compared to Muhd-Farouk et al. (2017) studied on size at the other commercial swimming crabs (Muhd- maturity and length-weight and width-weight Farouk et al., 2017). However, due to its flesh relationship, while Kannupandi et al. (1997) quality and more abundant compared to mud focused on water parameter (salinity) on crab (Muhd-Farouk et al., 2017), this species larvae and Sigana (2002) conducted a study is favoured by the local community as a source on breeding cycle of T. crenata. This species is of protein for their daily meals. As for their common in the Malaysian coastal waters, but landing, there is no data recorded previously, still there is scarce information, thus further thus proven that no in-depth study has been investigations are needed on natural diets of T. done on this species. crenata. Knowledge of natural diet in animal T. crenata can be classified as carnivorous species is generally essential to study to know and a predator. Its diet is mainly composed of their nutritional requirements, their interactions bivalves and slow-moving crustaceans (Cannicci with other organisms and their culture potential et al., 1996). Nonetheless, it also appears to be (Williams, 1981), besides for evaluation omnivorous as algae, seagrasses and other plant purposes and functioning of the ecosystems materials found in their stomachs (Cannicci et (Krebs, 1989). The knowledge gained can al., 1996). Moreover, cannibalism is common as support the expansion in terms of production the larger crabs feed on the young smaller crabs. and economy for this species in the near future. Though T. crenata is known to be a predator, Therefore, the investigation on natural diet on T. omnivorous and eats almost everything, the diet crenata is critical to understand the behaviour can still be influenced by the habitat that they and food preference between sexes of T. crenata, are living in, gender (sexes), maturity stage, which is important to develop successful seasons and their activity period (Sigana, 2002; aquaculture and farming techniques for this Hajisamae et al., 2015). Songrak et al. (2009) species (Ikhwanuddin et al., 2009). Besides, claimed that T. crenata activity period between the knowledge on the foregut fullness and the sexes were different, where males favoured dietary items found can be used as pioneer burrowing while females preferred swimming research towards in-depth understanding on this to search for their prey and both sexes were particular species. Therefore, the objectives of basically most active during the day (Chen et this study were to determine the natural diets al., 2005). of T. crenata through dietary composition and foregut fullness and to compare the body weight The present study on natural diets of T. and foregut fullness among different sexes of crenata focused on dietary composition and T. crenata from Setiu Wetlands, Terengganu foregut fullness. The data obtained can be Coastal Waters, Malaysia. helpful in understanding the feeding habits between sexes and also for fisheries management of T. crenata. The information on the foregut Materials and Methods fullness and dietary composition relationship Crab samples and sampling technique is important to understand the feeding habit T. crenata samples were from Setiu Wetlands, and nutritional requirement between male Terengganu, Malaysia and obtained at two and female T. crenata. Up to now, only a sampling stations: Sampling Station 1 (S1) and handful studies have been available that have Sampling Station 2 (S2) (Figure 1), from April focused on T. crenata , which were carried until June 2017 and the frequency for sampling out by Cannicci et al. (1996) and Mckillup J. Sustain. Sci. Manage. Volume 14 Number 4, August 2019: 25-37 NATURAL DIETS OF Thalamina crenata 27 Figure 1: The sampling stations at Setiu Wetlands, Terengganu, Malaysia (S1 = Sampling Station 1 (Latitude: 5.69º; Longitude: 102.72º) and S2 = Sampling Station 2 (Latitude: 5.65º; Longitude: 102.75º) was two days every week (Friday and Saturday). and differentiate the dietary items in the foregut Setiu Wetlands is located along the coast facing (Figure 2) using the crab collapsible traps. Crab the South China Sea in the state of Terengganu. collapsible trap is a traditional mud crab trap that It is located 60 km north of Kuala Terengganu. is simple but a very effective equipment which is Setiu Wetlands is one of the most important used to trap mud crabs (Poomikong et al., 2005). wetlands in Malaysia as it has mangrove areas No bait was used during sampling to avoid and salt marsh (Sigana, 2002) that are rich in bias in gut content analysis. Thirty collapsible biodiversity. traps were used during the biosampling of T. A total of 30 males and 30 females of the crenata. The collapsible traps were deployed in crab species T. crenata were sampled to identify the evening between 1600-1800 hours and left Figure 2: The dorsal (left) and ventral (right) view of T. crenata which was sampled from Setiu Wetlands, Terengganu, Malaysia J. Sustain. Sci. Manage. Volume 14 Number 4, August 2019: 25-37 Adnan Amin-Safwan et al. 28 overnight and collected early the next morning was handled in the most delicate way as the (0800-0900 hours). foregut is fragile and easily damaged. The The crabs captured in the collapsible traps fullness of the foregut was observed and were then immediately transferred and frozen recorded using the index of 1 to 4 (1 = 0-25% in an ice-chest (less than 1 hour) for physical foregut fullness, 2 = 25-50% foregut fullness, measurement. The crab body weights (BW) 3 = 50-75% foregut fullness and 4 = 75-100% and carapace width (CW) were measured of foregut fullness) (Ikhwanuddin et al., 2014) using an electronic balance (Shimadzu, Japan, (Figure 4). After the fullness index is completely identified, each foregut was fixed in formalin, in 0.001 g) and digital Vernier calliper (0.01 cm), TM respectively, according to the sexes of the crabs.
Load more

Recommended publications
  • (1 & 2): 101-119 on Decapoda Brachyura from The
    /. Mar. biol. Ass. India, 1961, 3 (1 & 2): 101-119 ON DECAPODA BRACHYURA FROM THE ANDAMAN AND NICOBAR ISLANDS 1. FAMILIES PORTUNIDAE, OCYPODIDAE, GRAPSIDAE AND MICTYRIDAE.* By C. SANKARANKUTTY Central Marine Fisheries Research Institute INTRODUCTION THE present paper begins a series on the brachyuran fauna of the Andaman and Nicobar Islands, and describes 29 species and a variety collected during February to March 1960 from (1) Localities around Port Blair, viz. Bimbletan, South Point, Corbins Cove, Aberdeen Bay, Phoenix Bay, North Bay and Kalapahad ; (2) Neil! Island ; (3) Car Nicobar ; (4) Maya Bandar ; (5) Long Island ; and (6) Nan- cauri. Of these reported in this account, 8 species and 1 variety are recorded for the first time from this region. Heller (1868) recorded 27 species of crabs belonging to the three famiUes Por- tunidae, Ocypodidae, and Grapsidae. Alcock (1899 & 1900) in his ' Materials for a Carcinological Fauna of India' described 35 species of portunids, 13 species of ocypodids and 24 species of grapsoids from the Andaman and Nicobar Islands, apart from Mictyris longicarpus Latreille. Later de Man (1908-09) reported Sesarma thelxionae de Man ; Kemp (1919) Macrophthalmus pacificus Dana (=M. bicari- natus Heller) and Dotilla wichmanni de Man and Chopra (1931) Lissocarcinus ornatus Chopra from the same region. The collections were made mainly from the coral reefs and the intertidal region, vast areas of which get exposed during the ebb tide. A number of specimens were collected from the submerged reef with the help of a mask and snorkel. Portunids were mainly collected with a small dredge operated at 10 metres in the Aberdeen Bay, Port Blair.
    [Show full text]
  • The Crustaceans Fauna from Natuna Islands (Indonesia) Using Three Different Sampling Methods by Dewi Elfidasari
    Short communication: The crustaceans fauna from Natuna Islands (Indonesia) using three different sampling methods by Dewi Elfidasari Submission date: 12-Jun-2020 04:25AM (UTC+0000) Submission ID: 1342340596 File name: BIODIVERSITAS_21_3__2020.pdf (889.25K) Word count: 8220 Character count: 42112 Short communication: The crustaceans fauna from Natuna Islands (Indonesia) using three different sampling methods ORIGINALITY REPORT 13% 12% 3% 4% SIMILARITY INDEX INTERNET SOURCES PUBLICATIONS STUDENT PAPERS PRIMARY SOURCES biodiversitas.mipa.uns.ac.id 1 Internet Source 3% australianmuseum.net.au 2 Internet Source 2% Submitted to Sriwijaya University 3 Student Paper 2% hdl.handle.net 4 Internet Source 1% repository.seafdec.org.ph 5 Internet Source 1% ifish.id 6 Internet Source 1% bioinf.bio.sci.osaka-u.ac.jp 7 Internet Source <1% marinespecies.org 8 Internet Source <1% Submitted to Universitas Diponegoro 9 Student Paper <1% Zhong-li Sha, Yan-rong Wang, Dong-ling Cui. 10 % "Chapter 2 Taxonomy of Alpheidae from China <1 Seas", Springer Science and Business Media LLC, 2019 Publication Ernawati Widyastuti, Dwi Listyo Rahayu. "ON 11 % THE NEW RECORD OF Lithoselatium kusu <1 Schubart, Liu and Ng, 2009 FROM INDONESIA (CRUSTACEA: BRACHYURA: SESARMIDAE)", Marine Research in Indonesia, 2017 Publication e-journal.biologi.lipi.go.id 12 Internet Source <1% issuu.com 13 Internet Source <1% ejournal.undip.ac.id 14 Internet Source <1% Arthur Anker, Tomoyuki Komai. " Descriptions of 15 % two new species of alpheid shrimps from Japan <1 and Australia, with notes on taxonomy of De Man, Wicksten and Anker and Iliffe (Crustacea: Decapoda: Caridea) ", Journal of Natural History, 2004 Publication mafiadoc.com 16 Internet Source <1% "Rocas Alijos", Springer Science and Business 17 % Media LLC, 1996 <1 Publication disparbud.natunakab.go.id 18 Internet Source <1% Rianta Pratiwi, Ernawati Widyastuti.
    [Show full text]
  • Portunidae 1115
    click for previous page Portunidae 1115 Portunidae PORTUNIDAE Swimming crabs iagnostic characters: Carapace hexagonal, transversely ovate to transversely hexagonal,some- Dtimes circular; dorsal surface relatively flat to gently convex, usually ridged or granulose; front broad, margin usually multidentate; usually 5 to 9 teeth on each anterolateral margin, posterolateral margins usually distinctly converging.Endopodite of second maxillipeds with strongly developed lobe on inner margin. Legs laterally flattened to varying degrees, last 2 segments of last pair paddle-like. Male abdominal segments 3 to 5 completely fused, immovable. anterolateral margin with 5-9 teeth 5 segments 4 3-5 fused, immovable 3 male abdomen sedments 3-5 immovable male abdomen last pair of legs paddle-like Habitat, biology, and fisheries: Benthic to semipelagic crabs with diverse habits. Many species of great fishery value, notably Scylla serrata, Portunus pelagicus, P. sanguinolentus, P. trituberculatus, and Charybdis feriatus. Similar families occurring in the area Portunids may be confused with spanner crabs (Raninidae) and moon crabs (Calappidae: Matutinae), which also possess paddle-like legs. They can be separated from portunids as follows: Raninidae: carapace usually longitudinally ovate; sternum very narrow; fingers of chela strongly bent; meri of third maxillipeds triangular (quadrate in portunids). Calappidae (subfamily Matutinae): carapace circular to subcircular; at least last 3 pairs of legs paddle-like, (not only the last pair); meri of third maxillipeds triangular in cross-section (quadrate in portunids). fingers strongly bent Calappidae (subfamily Matutinae) carapace all legs longitudinally ovate paddle-like Raninidae 1116 Crabs Key to species of interest to fisheries occurring in the area 1a. Carapace with 2 anterolateral teeth; eyes very long, reaching lateral edge of carapace (Fig.
    [Show full text]
  • Marine Science
    Western Indian Ocean JOURNAL OF Marine Science Volume 17 | Issue 1 | Jan – Jun 2018 | ISSN: 0856-860X Chief Editor José Paula Western Indian Ocean JOURNAL OF Marine Science Chief Editor José Paula | Faculty of Sciences of University of Lisbon, Portugal Copy Editor Timothy Andrew Editorial Board Louis CELLIERS Blandina LUGENDO South Africa Tanzania Lena GIPPERTH Aviti MMOCHI Serge ANDREFOUËT Sweden Tanzania France Johan GROENEVELD Nyawira MUTHIGA Ranjeet BHAGOOLI South Africa Kenya Mauritius Issufo HALO Brent NEWMAN South Africa/Mozambique South Africa Salomão BANDEIRA Mozambique Christina HICKS Jan ROBINSON Australia/UK Seycheles Betsy Anne BEYMER-FARRIS Johnson KITHEKA Sérgio ROSENDO USA/Norway Kenya Portugal Jared BOSIRE Kassim KULINDWA Melita SAMOILYS Kenya Tanzania Kenya Atanásio BRITO Thierry LAVITRA Max TROELL Mozambique Madagascar Sweden Published biannually Aims and scope: The Western Indian Ocean Journal of Marine Science provides an avenue for the wide dissem- ination of high quality research generated in the Western Indian Ocean (WIO) region, in particular on the sustainable use of coastal and marine resources. This is central to the goal of supporting and promoting sustainable coastal development in the region, as well as contributing to the global base of marine science. The journal publishes original research articles dealing with all aspects of marine science and coastal manage- ment. Topics include, but are not limited to: theoretical studies, oceanography, marine biology and ecology, fisheries, recovery and restoration processes, legal and institutional frameworks, and interactions/relationships between humans and the coastal and marine environment. In addition, Western Indian Ocean Journal of Marine Science features state-of-the-art review articles and short communications.
    [Show full text]
  • Crab Biodiversity from Arukkattuthurai to Pasipattinam, South East Coast of India
    676Indian Journal of Geo-Marine Sciences INDIAN J MAR SCI VOL 43(4), APRIL 2014 Vol. 43(4), April 2014, pp. 676-698 Crab biodiversity from Arukkattuthurai to Pasipattinam, south east coast of India D. Varadharajan & P. Soundarapandian Faculty of Marine Sciences, Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai-608 502, Tamil Nadu, India. [E-Mail: [email protected]] Received 30 July 2012; revised 14 January 2013 Coastal environment provides a greater range of habitats and thus potentially supports greater biodiversity. Before starting to produce seeds in a hatchery and culture them in ponds, thorough knowledge about their distribution in nature is important. So the present study is aimed to know the biodiversity of crabs from Arukkattuthurai to Pasipattinam. Totally 79 individual crab species were recorded belonging to 21 families from all 10 stations. Maximum crab species were recorded belonging to the family Portunidae than others families and also the maximum number of crab species 163 were recorded in Mallipattinam (station5) and minimum 69 species in Pasipattinam (station10). Occurrence of crab species in different stations were in the following order; Mallipattinam (163) > Sethubavachatram (161) > Manamelkudi (127) > Pointcalimere (117) > Muthupettai (116) > Jegathapattinam (110) > Kattumavadi (101) > Arukkattuthurai (92) > Adirampattinam (85) > Pasipattinam (69). Crabs were collected plenty during summer and monsoon than pre-monsoon and post-monsoon. The crabs belonging to families viz., Calappidae, Portunidae, Potamidae, Grapsidae, Sesarmidae and Ocypodidae were obtained almost all seasons. [Keywords: Crabs, Family, Portunidae, Distribution, Abundance] Introduction introduction are identified as main threat to 9 Biodiversity is important for human survival and biodiversity . India, a mega biodiversity country, economic interests and for the environmental purpose definitely needs conservation strategy to save the and stability.
    [Show full text]
  • Notes on the Macro-Benthos of Kenyan Mangroves
    Notes on the Macro-benthos of Kenyan mangroves. Item Type Report Authors Vannini, M.; Cannicci, S. Publisher Museum of Zoology, “La Specola”, University of Florence Download date 28/09/2021 16:56:48 Link to Item http://hdl.handle.net/1834/7903 NOTES ON THE MACRO-BENTHOS OF KENYAN MANGROVES by- Marco Vannini1 & Stefano Cannicci2 The notes were made for a post-graduate course in “Tropical coast ecology, management and conservation”, organised by Free University of Brussels and University of Nairobi, hosted at Kenya Marine and Fisheries Research Institute, with a support by IOC (Gazi, Mombasa, Kenya, July 1997). Acknowledgements. Many thanks are due to both Maddalena Giuggioli and Gianna Innocenti for their helping in preparing these notes and to Renyson K. Ruwa for his many suggestions during our field work. Most of the pictures (the beautiful ones !) are due to Riccardo Innocenti. Special thanks are due to Dr. E. Okemwa (KMFRI Director) for providing us many facilities during our work in Kenya. Our roads and Kenyan mangroves would probably never have met if one of these roads had not one day crossed Philip’s road. For those who have some experience of Kenya coastal ecology, Philip obviously cannot be anybody but Philip Polk, magnanimous spirit and, incidentally, Professor of Ecology at the Free University of Brussels. MANGROVE TREES Mangroves is the general name for several species (belonging to different families) of trees (including a palm tree) able to grow in an environment with 2.0-3.8 % of salinity. Mangrove is also the name for the whole trees association ; in this latter case the term mangal can also be used (as well as in Portuguese and French).
    [Show full text]
  • The Crustaceans Fauna from Natuna Islands (Indonesia) Using Three Different Sampling Methods
    BIODIVERSITAS ISSN: 1412-033X Volume 21, Number 3, March 2020 E-ISSN: 2085-4722 Pages: 1215-1226 DOI: 10.13057/biodiv/d210349 Short communication: The crustaceans fauna from Natuna Islands (Indonesia) using three different sampling methods RIANTA PRATIWI1,, DEWI ELFIDASARI2, 1Research Centre for Oceanografi, Indonesian Institute of Sciences. Jl. Pasir Putih 1, Ancol Timur, Jakarta Utara 14330, Jakarta, Indonesia. Tel.: +62-21-64713850, Fax.: +62-21-64711948, email: [email protected] or [email protected] 2Department of Biology, Faculty of Sciences and Technology, Universitas Al-Azhar Indonesia Jl. Sisingamangaraja Kebayoran Baru, South Jakarta 12110, Jakarta, Indonesia. Tel./fax.: +62-21-72792753, email: [email protected] Manuscript received: 21 November 2019. Revision accepted: 25 February 2020. Abstract. Pratiwi R, Elfidasari D. 2020. Short communication: The crustaceans fauna from Natuna Islands (Indonesia) using three different sampling methods. Biodiversitas 21: 1215-1226. Research on crustacean fauna has been carried out in Natuna waters. Natuna is the outer islands of Indonesia which is still very abundant in fisheries resources including crustaceans. Unfortunately, research on crustaceans is rarely carried out there, especially on the islands around Natuna. Therefore research and information about fisheries, especially crustaceans are needed. The study was conducted on 12-29 April 2011 and sampling locations around the Bunguran Islands, Sedanu, Kognang, Batang, and Sebangmawang. The sampling collection was focused on three different sampling methods, namely: bottom trawling, transects, and free collection. The purpose of this study is to find out which method is best used in crustacean fauna research and it is expected that the crustacean data obtained can add information about crustacean fauna found in the Natuna Islands.
    [Show full text]
  • Isozyme Variations in the Genus Thalamita of Family Portunidae from the Coastal Waters of Pakistan
    Journal of Aquaculture & Marine Biology Research Article Open Access Isozyme variations in the genus thalamita of family portunidae from the Coastal Waters of Pakistan Abstract Volume 6 Issue 1 - 2017 The genus Thalamita ofthe family Portunidae distributed in intertidal zone, especially in Noor Us Saher,1 Farah Naz,1 Mustafa rocky shore. They are important to economically because fishermen can take their meat to 2 sell at high price and also used as bait. Due to the privation scientific information and no Kamal 1Centre of Excellence in Marine Biology, University of Karachi, work has been done on these species, especially from a biochemical and genetic perspective, Pakistan consequently the present preliminary study attempted to evaluate the genetic variation in 2Department of Biotechnology, University of Karachi, Pakistan morphologically similar species of genus Thalamita by the use of electrophoresis. Isozyme variations were determined in four Thalamita spp, and seven enzyme system was selected, Correspondence: Noor Us Saher, Centre of Excellence in the study was revealed that the genetic diversity was highest in T. danae as compared to T. Marine Biology, University of Karachi, Karachi 75270, Pakistan, admete, and T. crenata and the lowest in T. savignyi. Genetic identity and genetic distance Email were also observed to evaluate the relationship between species. This selective information will be helpful to assess the status of the species and provides basic data for further studies. Received: July 19, 2017 | Published: July 31, 2017 Keywords: Thalamita, Native PAGE, Electrophoresis, Pakistan Introduction (Native-PAGE) of various isozymes as well as the role and significance of these molecules as biomarkers for particular species.
    [Show full text]
  • Journal of Environment and Aquatic Resources. 5: 1-9 (2020)
    1 Journal of Environment and Aquatic Resources. 5: 61-82 (2020) doi: 10.48031/msunjear.2020.05.05 An Annotated Checklist to the Commonly Harvested Crabs (Crustacea: Decapoda) from Marine and Brackish Water Ecosystems of Palawan, Philippines Billie P. Subang, Jr.1*, Riza G. San Juan2, Grecel Fatima C. Ventura1 and Nonillon M. Aspe3 1Provincial Fishery Office, Bureau of Fisheries and Aquatic Resources, Puerto Princesa City, Palawan, Philippines 2Binduyan Fisheries Research Station, Western Philippines University, Puerto Princesa City, Palawan, Philippines 3College of Science and Environment, Mindanao State University at Naawan, Naawan, Misamis Oriental, Philippines *corresponding author: [email protected] ABSTRACT Despite the abundance of commercially important and edible crabs in Palawan, there is no consolidated information on their taxonomy, distribution, and ecology that will serve as baseline data for management and conservation of these decapod species. Thus, this paper provides a consolidated information on the commonly harvested crab species of the marine and brackishwater ecosystems of Palawan. Eighteen species belonging to seven families, namely Coenobitidae, Raninidae, Matutidae, Portunidae, Ocypodidae, Varunidae, and Gecarcinidae were listed. Majority of these crabs are widely distributed in the province. Scylla and Portunus are two of the genera that have high commercial value, marketed both as local and export commodities. Among the species listed, only Birgus latro is considered as threatened species while Scylla spp. have specific size restriction if marketed for export. Other edible crab species are allowed for collection with certain regulatory measures. It is vital to take necessary measures to protect these species including their habitats from overexploitation as these could be source of livelihood commodity and tourist attraction in the future.
    [Show full text]
  • BIOLOGICAL INFORMATION and SIZE at MATURITY of MALE CRENATE SWIMMING CRAB, Thalamita Crenata from SETIU WETLANDS, TERENGGANU COASTAL WATERS
    Journal of Sustainability Science and Management ISSN: 1823-8556 Volume 12 Number 2, December 2017: 119-127 © Penerbit UMT BIOLOGICAL INFORMATION AND SIZE AT MATURITY OF MALE CRENATE SWIMMING CRAB, Thalamita crenata FROM SETIU WETLANDS, TERENGGANU COASTAL WATERS HARMAN MUHD-FAROUK1,2, ADNAN AMIN-SAFWAN1, MOHAMAD SAIFUL ARIF3 AND MHD IKHWANUDDIN1* 1Institute of Tropical Aquaculture, 3School of Marine and Environmental Sciences, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia. 2Fisheries Research Institute Batu Maung, Department of Fisheries, 11960 Batu Maung, Pulau Pinang, Malaysia. *Corresponding author: [email protected] Abstract: A study was conducted to determine the biological information (size at distribution, carapace width (CW) and body weight (BW)) and size at maturity of male crenate swimming crab, Thalamita crenata at Setiu Wetlands, Terengganu coastal water. Total of 121 samples of male T. crenata were collected from Setiu Wetlands, Terengganu in this study. The mean of CW and BW of males T. crenata was 6.69 ± 0.69 cm (range: 3.89 - 8.19 cm; n = 121). Only the healthy crabs reacted when being approached and having all of their appendages were chosen. Fifty crabs were randomly selected from the 121 samples and 40 crabs were classified as matured male (via morphological characteristics of vas deferens and spermatophore) with the most frequently size range was 7.0 - 7.9 cm CW (55%). This study concluded that the size at maturity (CW50) of male T. crenata occurred at 6.23 cm. Data obtained from this study could be used as the baseline data and useful in management and exploitation of this species for fisheries and aquaculture in Setiu Wetlands, Terengganu coastal water especially and Malaysia coastal water generally.
    [Show full text]
  • Impact of <Em>Thalamita Crenata</Em> (Decapoda
    SPC Beche-de-mer Information Bulletin #40 – March 2020 11 Impact of Thalamita crenata (Decapoda; Portunidae) predation on Holothuria scabra juvenile survival in sea farming pens Igor Eeckhaut,1,2,3* Jacques Février,1 Gildas Todinanahary2 and Jérôme Delroisse3 Abstract We evaluate the impact of predation by the crab Thalamita crenata on Holothuria scabra juvenile survival in a sea farming site in Madagascar where crab predation pressure is high. Three experiments were carried out: the first was conducted to estimate the survival of sea cucumber juveniles of different body masses when placed in open enclosures; the second compared the survival of juveniles placed in opened and closed enclosures; and the third evaluated the survival of juveniles when placed in the pres- ence of crabs in closed enclosures. Holothuria scabra juveniles were of a body mass between 1 and 80 g. The results showed that predation by T. crenata is a key parameter to take into account when farming H. scabra. The seeding of juveniles at sea should be performed with large individuals weighing at least 30 g to avoid predation. Introduction Some success in reducing predation of juvenile sea cucumbers released into the sea has been obtained with the use of cages Predation is one of the most important factors affecting the to exclude large predators (Dance et al. 2003; Purcell 2004; success or failure of sea cucumber farming. In the natural Rougier et al. 2013). On the other hand, in experiments car- environment, newly released juveniles are attacked and eaten ried out in a sea cucumber farming site where there was a very by different species of fish (Hamel et al, 2001; Pitt and Duy low density of crabs, Lavitra et al.
    [Show full text]
  • Fishery Biology of Spiny Rock Crab (Thalamita Crenata Latreille, 1829) in Sikao Bay, Trang Province, Thailand
    13 Fishery Biology of Spiny Rock Crab (Thalamita crenata Latreille, 1829) in Sikao Bay, Trang Province, Thailand Apirak Songrak 1* Worawut Koedprang 1 and Asnee Wangpittaya 2 1 Department of Fisheries Technology, Faculty of Science and Fisheries Technology, Rajamangala University of Technology Srivijaya, Trang Campus. 179 M.3 Maifad Subdistrict, Sikao District, Trang Province 92150 Thailand. 2 Halal Institute, Research and Development of Institute, Prince of Songkla University *Corresponding Author E-mail:[email protected] E-mail: [email protected] Abstract The fishery biology of spiny rock crab, Thalamita crenata (Latreille, 1829) was, studied in Sikao Bay, Trang Province, Southern of Thailand. Crabs were randomly sampled on monthly basis during October 2008 to September 2009 at Sikao canal. A total of 3,443 crabs was obtained, of which males and females were 1,674 (48.62%) crabs and 1,769 (51.38%) crabs, respectively. The size frequency distributions of female crabs were bigger than male crabs. The overall sex ratio (M:F) was 1:1.06 and significantly different from the ratio of 1:1. Results showed that the asymptotic carapace width (CW) of male and female were 83.00 and 84.20 mm and the curvature parameter (K) was 1.7 year-1 in both sexes. The total mortality coefficient (Z) of male was 7.54 year-1 and female was 7.98 year-1. The natural mortality coefficient (M) was 2.70 year-1. The fishing mortality coefficient (F) of male was 4.84 year-1 and female was 5.28 year-1. The exploitation rate (E) was 0.65.
    [Show full text]