Effects of square mesh bunt on by-catch reduction in white shrimp Nematopalaemon hastatus
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Date
2009
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Simultaneous paired fishing comparison of modified codend against conventional codend was done with shrimp beam trawl in near shore sea off Lagos.The modified codend was designed to reduce by-catch and was made by incorporating square mesh panel at anterior bunt. Results showed that the square mesh codend significantly reduced the by-catch of juvenile fishes up to 39.35% (T-test, P < 0.05; 0.01) with no significant loss (2.9%) in the quantity of the target shrimps Nematopalaemon hastatus (P > 0.05; 0.01). Commercially important by-catch species having a total length of 11-30cm were retained by the square mesh codend, while those with total length of 4-10cm were reduced eg; Pseudotolithus elongatus (43.96%, P < 0.05, 0.01), P. senegalensis (49.03%, P < 0.05; 0.01), P. typus (36.29%, P< 0.05; 0.01), llisha africana (39.09%, P< 0.05; 0.01), Pentanemus quinquarius (41.02%, P< 0.05; 0.01), Galeoides decadactylus (48.80%, P< 0.05; 0.01), Lutjanus dentatus (48.98%, P< 0.05; 0.01), Drepane africana (43.13%, P< .0.5;0. 01), Chloroscombrus chrysurus (55.29%, P< 0.05; 0.01), and Selene dosalis (34.60%, P< 0.05; 0.01). At family level, reduction in the number of 8 out of 13 important by-catch families analyzed were significant, e.g.; Clupeidae, Trichiuridae, Sciaenidae, Serranidae, Polynemidae, Carangidae and Lutjanidae (P< 0.05; 0.01). The number of flattened fishes (Cynoglossus senegalensis), Spinous fishes (Arius latiscutatus), shell fishes with morphometric body protection (Callinectes amnicola) were not significantly reduced (P> 0.05).Page Range
115-124Publisher or University
FISONConference Name
24th Annual Conference of the Fisheries Society of Nigeria (FISON)Conference Location
Akure, NigeriaConference Date
25-28 Oct 2009Collections