Open AccessSampling performance and operational quality of a frame trawl used to catch juvenile fish
Author(s) -
Itaya Kazuhiko,
Fujimori Yasuzumi,
Shiode Daisuke,
Aoki Ichiro,
Yonezawa Takashi,
Shimizu Susumu,
Miura Teisuke
Publication year - 2001
Publication title -
fisheries science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.412
H-Index - 64
eISSN - 1444-2906
pISSN - 0919-9268
DOI - 10.1046/j.1444-2906.2001.00279.x
Subject(s) - fishery , juvenile , marine engineering , fish <actinopterygii> , sampling (signal processing) , underwater , ichthyoplankton , environmental science , biology , engineering , geology , oceanography , ecology , telecommunications , detector
SUMMARY: A sampling trawl with a rigid mouth; that is, the frame trawl, was designed so as to catch the large larval and juvenile fish more efficiently. The net consisted of four 13 m panels (nylon multifilament and twine diameter φ 0.75 mm, mesh size 8 mm). The frame of the net's mouth was composed of four stainless steel pipes (length 4 m, diameter φ 76 mm, thickness 5 mm). Several operations were conducted to investigate the capability of catching juveniles. A lot of Sardinops melanostictus juveniles, which are generally difficult to catch, were caught during every operation. Underwater observations proved that juveniles could not elude the capture. The frame trawl requires no special handling and is possible to operate in a rough sea.