Publication Date:
2021-07-13
Description:
Fishing experiments with conventional and modified codends were conducted to reduce fish by-catch from shrimp beam trawl fisheries off Lagos coast, Nigeria. The modified codend consist of Nordmore gride with a guarding panel and bar spacing of 20 mm. simultaneous paired comparisons against conventional codends showed that the modified codend significantly reduced the by-catch of juvenile fishes up to 72.06% (T-test, p〈0.05;0.01) with no significant reduction(2.9%) in the quantity of the target shrimps, Nematopaaemon hastatus (T-test,p〉0.05;0.01). SmaIl sized and fusiform shape fishes with total length range of 4 to 10 cm were mostly retained by the modified codend, eg. Epinephelus aenus (p〉0.05;0.01) and Pomadasys jubelini (p〉0.05;0.01) while large and flattened fish specimens with a total length range of 11 to 30 cm were mostly excluded, eg. Dasyatis margarita (p〈0.05;0.01) and Carcharhinus brachyrus (p〈0.05;0.01). The high percentage reduction of the 3 species of most abundant and priortised croaker by-catch family sciaenidae e.g Pseudotolithus elongatus (72.73%, p〈0.05;0.01), P. senegalensis(66.65%,p〈0.05;0.01) and P. typus (68.33, p〈0.05;0.01) makes the BRD a conservation tool for commercial application. The potential of Nordmore gride to alleviate by-catch problem and its limitation in a developing economy is discussed.
Description:
Include:- 3 tables.;3 figs.;23refs.
Keywords:
Fisheries
;
Nematopalaemon hastatus
;
ASE
;
Nigeria
;
Lagos
;
marine environment
;
By catch
;
Trawling
;
Codends
;
Shrimp fisheries
Repository Name:
AquaDocs
Type:
conference_item
,
TRUE
Format:
application/pdf
Format:
application/pdf
Format:
26-37
