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Fish Biodiversity and Conservation Status in Uthrail Beel of Naogaon District, Bangladesh

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Fish Biodiversity and Conservation Status in Uthrail Beel of Naogaon District, Bangladesh Univ. j. zool. Rajshahi. Univ. Vol. 37, 2018 pp. 28-34 ISSN 1023-6104 http://www.ru.ac.bd/zoology/university-journal-of- © Rajshahi University Zoological Society zoology-rajshahi-university/ Fish Biodiversity and Conservation Status in Uthrail Beel of Naogaon District, Bangladesh Khanom, D.A., Aktar, M.R., Joadder, A.R. and Jewel, M.A.S Department of Fisheries, University of Rajshahi, Rajshahi 6205, Bangladesh Abstract: Fish abundance and diversity was studied for a period of 5 months from August to December 2018, in the Uthrail beel at Manda Upazila under Naogaon district, Bangladesh. Data were collected fortnightly from two sampling points, one point was 1 km far from another of Pakuria village of Bharso Union, using four fishing gears namely berjal, moijal, fashjal and kholson. A total of 3987 individuals comprising of 28 fish species belonging to 8 orders, 16 families including 2 exotic species (Cyprinus carpio var. communis) and Oreochromis niloticus (niloticus) were found. Cypriniformes was recorded as dominant order contributing 40.62% and the rest 7 orders Perciformes, Siluriformes, Synbranchiformes, Channiformes, Beloniformes, Tetraodontiformes and Osteoglossiformes contributing 26.31%, 12.4%, 9.77%, 7.59%, 2.90%, 0.22% and 0.10% respectively. Puntius chola (chola puti) was the most abundant (30.8%) and Monopterus cuchia (Kuchia) was the least abundant (0.05%) species. Total six threatened species were recorded (according to IUCN, 2015) of which four (2.90%) are Vulnerable, one (0.4%) as Endangered and one (1.22%) as Critically Endangered. The average value of Shannon -Weiner Diversity Index (H), Simpson Dominance Index (D) and Margalef Richness Index (d) were calculated as 2.232±0.14, 0.126±0.03and 2.764±0.29 respectively. The study revealed that fish diversity in Uthrail beel is lesser than other reported beels and rivers in Bangladesh. Key words: Diversity, fish composition, Uthrail beel, Bangladesh, dominance, richness. Introduction et al. (2016) in Beel Kumari, Rajshahi; Akhtaruzzaman & Alam (2014) in Ichanoi beel, Bangladesh is a South East Asian riverine Gaibandha; Ehshan & Bhuiyan (2014) in country of 1,47,570 sq. km located in between Roktodaha beel a Flood plain of North - latitude 2034 and 2638 north and longitude Western Region of Bangladesh; Hussain et al. 4001 and 9241 east. The country is (2013) in Beel Bhatia, Chapai Nawabganj and enriched with vast water resources of both Imteazzaman and Galib (2013) in Halti beel, freshwater and marine water. Bangladesh is Natore. However, information regarding fish ranked 4th in aquatic biodiversity in Asia, and diversity of Uthrail beel is unavailable till now. abound with large varieties of species So, a study was conducted to know the status including 260 of freshwater fish species, 24 of fish diversity of this beel and to take species of prawn in inland water bodies, 475 necessary management techniques to species of marine fishes, 36 species of marine conserve its fish biodiversity by calculating shrimp and 12 species of exotic fishes diversity indices and catch composition. (Ahammad et al. 2017). At present reduction of fish species abundance from inland open water bodies is a burning issue. IUCN (2015) Materials and Methods has reported as many as 253 species of fish,64 species (25.3%) of which are as Study area: The study was carried out at threatened. Among these threatened species Uthrail beel in Manda Upzila under Naogaon 9 are assessed as Critically Endangered, 30 district, Bangladesh. The beel is surrounded species as Endangered and 25 species as by three villages namely Pakuria, Kalishova Vulnerable. Beel is one of the most important and Bharso. The study area lies in between natural habitat for fish comprising 27% of the 2443 and 2444 North to 8838 and 8840 inland water area (DoF, 2018). Uthrail beel is East occupying an area of about 165 acre one of the most important beel situated in (Figure 1). Manda Upazila of Naogaon district of Study period: The research was conducted Bangladesh. Study on fish biodiversity has for a period of 5 months from August to been assessed in different beels by December 2018, with a view to achieve researchers like Majumder et al. (2017) in information on the status of fish diversity of Shorupdha beel, Jessore; Rhaman et al. Uthrail beel. (2017) in Chalan beel Natore; Sultana et al. (2017) in Bhawal beel, Mymensingh; Joadder 28 Corresponding author: [email protected] Fish distribution and biodiversity in Uthrail beel, Bangladesh Figure 1: Map of Manda Upazila of Naogaon District showing the study area Uthrail beel Data collection and identification of fish Shannon-Weiner Diversity Index (H) species: Data were collected fortnightly from two sampling points (Pakuria and Bharso) H Piln Pi (Shannon- Weiner, 1949) using four types of fishing gears comprising 3 types of net (berjal, moijal, fashjal) and 1 type Here, H is the diversity index of trap (kholson). The hauling time was 30 min Pi is the proportion of each species in and 10-12 min for berjal and moijal. Data of the sample. one haul was considered for analysis. Average catch of two sampling points was presented as Simpson Dominance Index (D) mean value of the beel. Fish samples from ni (ni 1) each fishing gear were counted species wise. D (Simpson, 1949) After collection, the fish species were identified N(N 1) by assessing their morphometric and meristics characteristics, colour of the fish sample, Here, D is the dominance index following Rahman (2005); Talwar and Jinghran n is the total number of individuals of (1991) and Red List of Bangladesh (2015). each species Then, the identified fish species were classified systematically after Nelson (2006). N is the total number of fish of all species Analysis of fish diversity and catch composition: During the investigation, Margalef Richness Index (d) different diversity indices such as Shannon- S 1 Weiner diversity index (H), Simpson d Margalef, (1968) ln N dominance index (D) and Margalef richness index (d) were calculated to evaluate the status of fish diversity in Uthrail beel using Here, d is the richness index following formulae: S is the total number of individuals for each species N is the total number of individuals. 29 Khanom et al. Fish distribution and biodiversity in Uthrail beel, Bangladesh (%) Catch composition highest value 2.42 was recorded in November. So, the fish diversity was highest in November. n 100 No significant differences were found between N the months. Here, n is the total number of individuals of Shannon-Weiner diversity index (H) was each species reported 2.31±0.69 in Surma river Sylhet (Ahammad et al. 2017); 0.45 to 2.3 in Shiba N is the sum of all fish individuals river (Khanom et al. 2016); 1.06 to 1.51 in caught in the study period. Talma river (Rahman et al. 2015); 3.22 in Data analysis: Calculation and graphical Roktodaha beel (Ehshan and Bhuiyan, 2014) presentation of different biodiversity indices and 3.427 to 3.818 in Choto Jamuna river were performed using Microsoft Excel- 2010. (Galib et al. 2013) The documented value of Shannon- Weiner diversity index (H) was 2.05 to 2.42 which was Results and Discussion lower than the value of Choto Jamuna river, Fish Species Diversity Indices Upper Halda river, Surma river, Roktodaha beel but higher than Shiba and Talma rivers. Diversity index is a mathematical measure of So, it can be said that fish diversity of Uthrail species diversity in a given community which beel is richer than the Shiba and the Talma provides information about community rivers. composition and also takes the relative abundance of different species into account. It Simpson Dominance Index (D) also provides important information about Simpson dominance index (D) was introduced rarity and commonness of species in a by Edward H. Simpson in 1949 to measure the community. The ability to quantify diversity in degree of concentration when individual is this way is an important tool for biologist trying classified into types. The index represents the to understand the community structure. probability that two individuals randomly Shannon- Weiner Diversity Index (H) selected from a community will belong to different species. The value of this index The Shannon-Weiner diversity index (H) is an ranges between 0 to 1. Here, the bigger the information statistical index which means it value of (D), the lower the diversity. assumes all species are represented in a sample and that they are randomly sampled. The maximum value of Simpson dominance The typical value of H generally lies in index was recorded as 0.16 and minimum between 1.5 to 3.5 in most ecological studies value was 0.10 which were recorded in and the index is rarely greater than 4. Here, August, and in November and December the higher the value, the greater the diversity respectively, with a mean value of 0.13±0.03. (Table 1). No significant differences found between the value in different months (Table 1). Table -1: Fish species diversity indices of Uthrail beel during the study period. Simpson dominance index (D) was reported to range from 0.05 to 0.06 in Upper Halda river Value (Alam et al. 2013) and 0.32 to 0.89 in Dhaleshawri river (Islam and Yasmin 2018) Months Shannon- Simpson Margalet Weiner dominance richness The observed values of the present study of Divinity (H) index (D) index (d) Simpson dominance index (0.10 to 0.16) was August 2.05 0.16 2.27 lower than the values of Dhaleshawri river but higher than Upper Halda river. So fish species September 2.17 0.15 2.92 diversity in the studied beel is more than the October 2.19 0.12 2.74 Dhaleshawri river but less than the Upper Halda river.
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