Standardization of Thunnus tonggol Bleeker, 1851 (Longtail tuna)surface gillnet mesh size in order to come up with the sustainable fishing pattern in Northern of the Persian Gulf and Oman Sea (Hormuzgan Province)

Document Type : Other

Authors

1 Department of Fisheries, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, PO Box: 487-49175

2 Institute of Fisheries Research, Agricultural Research and Training Organization, Tehran, POBox: 6116-14155

Abstract

In order to come up with the sustainable fishing pattern of longtail tuna, there was a need to the gillnet mesh size designed   to allows immature fishes escape and provide an opportunity for them to spawn at least once. In this review original   gillnet mesh size (140 mm stretched), 114 and 132 mm mesh size nets were examined. The percentage of immature species in 140, 132 and 140 mm nets were 97%, 84% and 78% respectively. The linear relationships between fork length and head (in pre gill), gill, body (in first dorsal fin) and second dorsal fin perimeters were (HP=0.48FL+0.83), (GP=0.51FL+2.35), (BP=0.60FL+0.87) and (SDP=0.49FL+3.89) respectively. There was significant coefficient between linear equations and perimeter in first dorsal fin was maximum body perimeter. The elastic ratio were 24% in first dorsal fin and 19% in head and gill. The optimum standard gillnet mesh size based on relationship between fork length - body and length at first   maturity was 170 mm stretched.

Keywords

References

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Journal of Animal Environment
Volume 9, Issue 3
September 2017
Pages 427-434

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