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Research Article: Some Biological Parameters of Glossogobius Aureus

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Research Article: Some Biological Parameters of Glossogobius Aureus Iranian Journal of Fisheries Sciences 20(1) 84-95 2021 DOI: 10.22092/ijfs.2021.123478 Research Article Some biological parameters of Glossogobius aureus population from the Mekong Delta Dinh Q.M.1*; Tran N.Q.2; Tran D.D.3 Received: May 2017 Accepted: July 2017 Abstract Glossogobius aureus is an important commercial fish for food supply and has been caught increasingly, but data on its population biology is limited. The present study was carried out along coastlines from Soc Trang to Bac Lieu, southern Vietnam to contribute new information on the biological characteristics of G. aureus population. Data analysis of length-frequency distribution of 666 individuals showed that the 0.72(t 0.12) equation of von Bertalanffy curve of this species was Lt 27.971e . The species displayed 4.47 y longevity and 2.75 in the growth performance. The length- converted catch curve analysis showed that the fishing, natural and total mortalities were 2.73 yr-1, 1.52 yr-1 and 4.25 yr-1 respectively and fish exploitation rate was 0.64. There was one recruitment peak in July and the analyses of relative yield-per-recruit and biomass-per-recruit gave Emax=0.408, E0.1=0.284 and E0.5=0.404. This goby is potentially an aquaculture species due to its high growth rate. The fish stock has been overfished, so the gill net mesh size should be increased and fish should not be caught during the recruitment period for sustainable management. Downloaded from jifro.ir at 14:58 +0330 on Monday September 27th 2021 Keywords: Glossogobius aureus, Mortality, Growth, Longevity, Exploitation rate, Mekong Delta 1-Department of Biology, School of Education, Can Tho University, Can Tho 900000, Vietnam. 2-Luong Tam High School, Hau Giang 910000, Vietnam 3-Department of Fisheries Management and Economics, College of Aquaculture and Fisheries, Can Tho University, Can Tho 900000, Vietnam *Corresponding author's Email: [email protected] 85 Dinh et al., Some biological parameters of Glossogobius aureus population from… Introduction species lives from estuaries to upper Fisheries management is strongly stream of Hau and Tien River basins related to the exploitation rate that was (Tran et al., 2013). This fish species estimated from the analysis of the yield- spawns with a batch fecundity of per-recruit, according to Beverton and 30,800–276,400 eggs/female during the Holt (1957). Ricker (1975) reported that late wet season from September to the assessment of a fish population December and matures firstly at 13.02 depends on the growth and mortality cm in total length (Nguyen et al., 2014). parameters. The growth performance The goby G. aureus shows negative obtained from the analysis of growth allometric growth, according to the and asymptotic length relationship, study of Dinh (2014). This goby plays additionally, are related to the an important role in food supply and is variations of fish growth rate between a target species for fishing in the genders and locations (Pauly and Mekong Delta; however, the knowledge Munro, 1984). The understanding of of this species is limited to morphology, gobiid population dynamics in the environmental requirements, Mekong Delta is limited to some reproductive biology and growth species such as Pseudapocryptes pattern (Tran et al., 2013; Dinh, 2014; elongatus (Tran et al., 2007), Nguyen et al., 2014; Froese and Pauly, Parapcryptes serperaster (Dinh et al., 2017). Albeit G. aureus is a commercial 2015b), Glossogobius giuris (Dinh et fish and is being increasingly exploited al., 2017) and Boleophthalmus boddarti (Diep et al., 2014), there is no (Dinh, 2017) whereas the rest of gobiid information on the population biology species have not been reported. of this goby, especially in the Mekong Glossogobius is a large genus with Delta. Therefore, this study aims to 29 species (Froese and Pauly, 2017), provide new data on the biological Downloaded from jifro.ir at 14:58 +0330 on Monday September 27th 2021 but only three species, G. giuris, G. parameters to understand its stock and aureus and G. sparsipapillus, are management. recorded in the Mekong Delta, Vietnam (Tran et al., 2013). Glossogobius Materials and methods aureus was described firstly by Akihito Study site and Meguro (1975) and widely This study was carried out for a year- distributed in brackish and freshwaters round from January 2016 to December in South Africa, Asia and Oceania 2016 in the mudflat and mangrove regions, according to Rainboth (1996). forests from Ganh Hao (9°06'12.9"N This species is a native amphidromous 105°29'47.8"E) and Nha Mat fish to 13 countries (Froese and Pauly, (9°12'15.8"N 105°43'51.8"E, Bac Lieu 2017), including Vietnam (Tran et al., Province) to Tran De (9°28'47.41"N, 2013). This goby is a zoobenthic 106°12'25.96"E, Soc Trang Province, predator feeding mainly on small fish Fig. 1), Vietnam. Both Soc Trang and and crustacean in Cambodia (Rainboth, Bac Lieu are fringed by large mangrove 1996). In the Mekong Delta, this forests (Avicennia marina and Iranian Journal of Fisheries Sciences 20(1) 2021 86 Sonneratia caseolaris) with long (June–December) with monthly coastlines and vast mudflats. Semi- precipitation of 400 mm. With a mean diurnal tides with a range of 1.2 m are annual temperature of 27 °C, these typical for the tide of these two provinces are typical for the natural provinces. There are two seasons environment condition in the Mekong including the dry season (January–May) Delta, according to Le et al. (2006). with little rain and the wet season Figure 1: The sampling map in the Mekong Delta (: Sampling sites). Fish collection and analysis total length and weighed to the nearest A group of nine bottom gill nets (1.5 0.01 g in fish body weight. cm mesh aperture in the cod-end-size Data analysis Downloaded from jifro.ir at 14:58 +0330 on Monday September 27th 2021 range of the gill-nets) was used to FiSAT II software was used to estimate collected fish specimens. At the highest the biological parameters of the fish tide, a group of three gill nets were set population based on length frequency along the mudflat and mangrove forest data, according to Gayanilo et al. in each study site; and after 2–3 h (2005). The ELEFAN I procedure was during an ebb, gill nets were retrieved performed to calculate the asymptotic to collect fish specimens, according to length (L∞) and the growth parameter Dinh et al. (2015a). Fish were identified (K) (Pauly and David, 1981; Pauly, using the external description given by 1982; Pauly, 1987) and the length- Akihito and Meguro (1975), sexed converted capture curve was used to according to the morphology of determine the total mortality rate (Z) urogenital papilla shape (Dinh, 2014) (Beverton and Holt, 1957; Ricker, and anaesthetized with benzocaine 1975). Based on Pauly (1980), the before storing in 5% formalin and natural mortality rate (M) was transporting to the laboratory. Fish was calculated from the equation then measured to the nearest 0.1 cm in 87 Dinh et al., Some biological parameters of Glossogobius aureus population from… (L∞ and K were two parameters of the performance was calculated as von Bertalanffy curve, T was the mean ’=LogK+2LogL∞ (K and L∞ are two annual water temperature (oC) in the parameters of the von Bertalanffy study region). The fishing mortality (F) curve) and used to compare the von and exploitation rate (E) were finally Bertalanffy growth parameters of G. calculated as F = Z – M and the E = F/Z aureus with other gobiid species in or respectively (Ricker, 1975). different genus dwelling in the same or The length-converted catch different habitat, according to Pauly and procedure was used to estimate the Munro (1984). The longevity (tmax) was probability of capture for each size 3 calculated as tmax K where K was the class and the fish length at first entry growth constant of the von Bertalanffy into the population for catching (L ), c curve (Taylor, 1958). and the time of recruitment was estimated from the recruitment pattern Results procedure (Pauly, 1987). The yield-per- There were five size groups (e.g., five recruit model of Beverton and Holt growth curves or dark lines, Fig. 2) in (1957) was used to calculate the goby the population of G. aureus based on stock and yield, according to Sparre and the length-frequency analysis of 666 Venema (1992). The maximum yield individuals (396 females and 270 exploitation rate (E ), the exploitation max males, Table 1, 6.0–20.0 cm in TL). rate with the minimal increase of 10% The smaller fish grew slightly faster of yield per recruitment (E ) and the 0.1 than the bigger fish due to a slight slope exploitation rate with the reduction of in the larger fish group. This species stock to 50% (E ) were computed 0.5 displayed the von Bertalanffy growth from the knife-edge selection procedure 0.72(t 0.12) curve as Lt 27.971e (Beverton and Holt, 1966). Moreover, a Downloaded from jifro.ir at 14:58 +0330 on Monday September 27th 2021 based on the analysis of the growth combination analysis of isopleth (Lc/L∞) and E was used to estimate the fishing increment data performed using the status as described by Pauly and NORMSEP procedure (Fig. 3). Soriano (1986). The growth Figure 2: Length-frequency distribution of Glossogobius aureus (n = 666). The curves show the increase of fish length over time. Iranian Journal of Fisheries Sciences 20(1) 2021 88 Figure 3: The von Bertalanffy growth curve of Glossogobius aureus based on growth -1 -1 increment analysis (L = 27.97 cm, t0 = –0.12 yr , K = 0.72 yr ).
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