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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Sep 2018, 39 (5)                                                                                                             Back



nstantaneous and historical temperature effects on a-pinene

Influence of seasons, habitat sanctuaries, gears and

environmental variables on the catches of hilsa shad

(Tenualosa ilisha) in Bangladesh waters

 

M. Jalilur Rahman1, S. M. Nurul Amin2*, M. Nahiduzzaman1, M. A. Wahab1 and N. Romano3

1ECOFISH-Bangladesh Project, WorldFish, Bangladesh & South Asia Office, Banani, Dhaka, 1213 Bangladesh

2Laboratory of Fisheries Biology and Ecology, Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia

3 Aquaculture/Fisheries Center, University of Arkansas at Pine Bluff, 1200 North University Drive, Pine Bluff 71601, AR, USA

*Corresponding Author E-mail: smnabd@gmail.com

 

 

 

Key words

CPUE variations

Dissolved oxygen

Environmental variables

Habitat sanctuaries

Hilsa shad

 

 

 

Publication Data

Paper received : 15.03.2017

Revised received : 20.05.2017

Re-revised received : 05.09.2017

Accepted : 28.12.2017

 

Abstract

Aim: Variations in catch per unit effort (CPUE) of hilsa (Tenualosa ilisha) at different habitats (sanctuaries) of Bangladesh waters were observed to understand whether CPUE variations were due to differences in habitat complexity, environmental factors or both.

 

Methodology: CPUE of hilsa data were collected from five different habitats in Bangladesh waters between July 2015 and June 2016. Various in-situ physico-chemical parameters were measured monthly and then examined for any relationship to CPUE.

 

Results: The overall mean CPUE of hilsa from the investigated areas was estimated to be 7.93 6.03 kg gillnet-1 day-1. The monthly average values of CPUE was the highest in January 2016 amounting 11.63 1.21 kg gillnet-1 day-1 and the lowest in March 2016 amounting 3.63 0.83 kg gillnet-1 day-1 with significant differences among the months (p < 0.05). Gillnet mesh sizes influenced the capture of hilsa with the highest (9.18 kg gillnet-1 day-1) and lowest (6.05 kg gillnet-1 day-1) catch obtained from the smallest (3.0 cm) and largest (11.0 cm) mesh size, respectively. There was a lower degree of positive and negative correlation (p > 0.05) with environmental variables and CPUE. Multiple regression analysis tests also indicated a weak overall correlation (62%) between environmental variables and CPUE of hilsa.

 

Interpretation: Results likely indicate that habitat structure was more important in determining CPUE of hilsa (highest in Padma sanctuary) compared to environmental factors at the tested sites. This study emphasizes the need to conserve habitats that are often used as important fishing grounds for hilsa to ensure their adequate recruitment and ultimately sustainable management of this fishery.

 

 

 

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