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Length-weight Relationships of Nine Fish Species from the Tetulia River, Southern Bangladesh

M. Y. Hossain
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

S. R. M. Sayed
Department of Zoology,College of Science, King Saud University, Riyadh, Saudi Arabia

M. Mosaddequr Rahman
Faculty of Fisheries, Kagoshima University, Kagoshima, Japan

M.M. Ali
Department of Aquaculture, Faculty of Fisheries, Patuakhali Science and Technology University, Patuakhali, Bangladesh

M. A. Hossen
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

A. M. Elgorban
Department of Botany and Microbiology, College of Science, King Saud University, Saudi Arabia

Z. F. Ahmed
Department of FisheriesManagement, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh

J. Ohtomi
Faculty of Fisheries, Kagoshima University, Kagoshima, Japan

Abstract/ Executive Summary:

The present study describes the length-weight relationships (LWRs) for nine fish species from the Tetulia River, southern Bangladesh, namely Anabas testudineus, Coilia dussumieri, Otolithoides biauritus, Otolithoides pama, Pethia conchonius, Polynemus paradiseus, Puntius lateristriga, Setipinna tatyand Sillaginopsis panijus.A total of 1380 specimens were caught using traditional fishing gear from March 2012 to February 2013. Individual total length (TL) and body weight (BW) was measured by digital slide calipers and digital balance, respectively. The LWR was calculated as W= aLb, where the is the BW in g and the TL in cm, and are regression parameters. This study presents the very first references on LWRs for seven of the species. The results are valuable for the application of sustainable management and conservation of these fishes in the Tetulia River and surrounding ecosystems.

Keywords: Length-weight relationships, Fish species, Tetulia River, Bangladesh

Location: Tetulia River, southern Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Fish

Objectives:

In the present study, we report LWRs for nine fish species from the Tetulia River, southern Bangladesh, to expand the biological knowledge of these species

Methodology:

This study was conducted in the Tetulia River, southern Bangladesh. It is also one of the largest riverine ecosystems of southern Bangladesh near the Bay of Bengal and supports diverse fisheries communities. Samples were collected on an aseasonal basis from fishermen’s catches landed at the Kaliafish landing centre of the Barisal region, March 2012 to February 2013. The main gear used by the commercial fishers included seine net, cast net, square lift net, conical trap and monofilament fixed gill net. The fresh samples were immediately chilled on-site in ice and fixed with 10% buffered formalin upon arrival at the laboratory. Species identifications were made based on morphometric and meristic characteristics according to Froese and Pauly (2015). The total length (TL) of each fish was measured to the nearest0.1 cm with a slide caliper (Mitutoyo; CD-15PS; Mitutoyo Corporation, Tokyo, Japan), and the individual body weight(BW) was recorded to the nearest 0.01 g using a digital balance (Shimadzu, EB-430DW; Shimadzu Seisakusho, Tokyo, Japan). All LWRs were estimated using the allometric models W=a*Lb, where-is the total body weight (BW, g), L the total length (TL, cm), and and are the regression parameters. Parameters a and b of the LWR were estimated by linear regression analysis based on natural logarithms:ln(W) = ln(a) + b ln(L). Prior to regression analysis ln-in plots of BW and TL were used to detect and exclude outliers (Froese, 2006). Statistical analyses were performed using Graph Pad Prism 5 software (GraphPad Software, Inc., San Diego, CA). At-test was applied to determine significant differences from the isometric value of b=3 for LWR. All statistical analyses were considered significant at 5% (P<0.05).

Source of Information: J. Appl. Ichthyol. (2015), ISSN 0175–8659

Article Link (Online Journal): doi: 10.1111/jai.12823

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, b values were within the limits (2.5–3.5) reported by Froese (2006) for most fishes. Earlier studies from Bangladesh, Thailand and the Philippines revealed negative allometric growths in A. testudineus (b values ranged from 2.51 to 2.84), in accordance with the findings in our study in terms of growth type, although some of these studies found much lower values (Froese and Pauly, 2015). However, the differences in values can be attributed to the combination of one or more factors including habitat, area, seasonal effect, degree of stomach fullness, gonad maturity, sex, health, preservation techniques and differences in the observed length ranges of the captured specimens (Gonzalez-Acosta et al.,2004; Hossain et al., 2006a,b, 2013b, 2014; Ruiz-Campos et al., 2006), all of which were not similar among those studies. On the other hand, there are no references on LWRs for the remainder of the species in the present study. Although LWRs are easily obtained, they remain absent for many species in Bangladesh, including those species mentioned earlier. Therefore, our study provides a significant baseline study on the LWRs of nine fish species from Bangladesh. These results are useful for further studies or for other key parameters needed for fisheries management in the Tetulia River, southern Bangladesh. Additionally, this study provides basic information for the Fish Base database.

Knowledge Management: Journal