Size Selectivity of Square Mesh Codends for Saurida tumbil (Bloch 1795) and Nibea maculata (Bloch & Schneider, 1801) in Bay of Bengal

Raghu Prakash R.; Rajeswari G.; U. Sreedhar U.; Swamy Kumar M.

doi:10.56093/ft.v50i4.34153

Authors

Raghu Prakash R. Research Centre of Central Institute of Fisheries Technology, Ocean View Layout, Pandurangapuram, Visakhapatnam - 530 003, India
Rajeswari G. Research Centre of Central Institute of Fisheries Technology, Ocean View Layout, Pandurangapuram, Visakhapatnam - 530 003, India
U. Sreedhar U. Research Centre of Central Institute of Fisheries Technology, Ocean View Layout, Pandurangapuram, Visakhapatnam - 530 003, India
Swamy Kumar M. Research Centre of Central Institute of Fisheries Technology, Ocean View Layout, Pandurangapuram, Visakhapatnam - 530 003, India

https://doi.org/10.56093/ft.v50i4.34153

Keywords:

Codend selectivity, square mesh codend, mean selection length, selection factor, Saurida tumbil, Nibea maculata

Abstract

Saurida tumbil and Nibea maculata are widelyÂ exploited by the trawl fishery. Due to the use ofÂ conventional diamond mesh codends of small meshÂ size in the trawl nets, large quantities of juvenilesÂ of these species are landed along the east coast ofÂ India. The size selectivity of 40 mm square meshÂ codend for S. tumbil and N. maculata was studiedÂ with a 30 m demersal trawl, following coveredÂ codend method. The L25, L50 and L75 values for S.tumbil with 40 mm square mesh codend wasÂ estimated as 16.2, 19.3 and 22.5 cm respectively. Selection range, selection factor and selection ratioÂ for S. tumbil were 6.2, 4.8 and 1.5 respectively. TheÂ L25, L50 and L75 values for N. maculata with 40 mmÂ square mesh codend were 9.3, 10.9, and 12.5 cmÂ respectively. Selection range, selection factor andÂ Selection ratio for N. maculata were 3.2, 2.7 and 0.8Â respectively. Characteristic smooth sigmoid curvesÂ typical for towed gears were obtained for S. tumbil andÂ .maculata.

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Author Biographies

Raghu Prakash R., Research Centre of Central Institute of Fisheries Technology, Ocean View Layout, Pandurangapuram, Visakhapatnam - 530 003, India

Senior Scientist
Rajeswari G., Research Centre of Central Institute of Fisheries Technology, Ocean View Layout, Pandurangapuram, Visakhapatnam - 530 003, India

Principal Scientist
U. Sreedhar U., Research Centre of Central Institute of Fisheries Technology, Ocean View Layout, Pandurangapuram, Visakhapatnam - 530 003, India

Senior Scientist
Swamy Kumar M., Research Centre of Central Institute of Fisheries Technology, Ocean View Layout, Pandurangapuram, Visakhapatnam - 530 003, India

Technical Officer