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Contributions to the Biology of the Cutlassfish ( Trichiurus lepturus ) in the Northern Gulf of Mexico
Author(s) -
Dawson C. E.
Publication year - 1967
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1967)96[117:cttbot]2.0.co;2
Subject(s) - fishery , fish <actinopterygii> , submarine pipeline , oceanography , abundance (ecology) , catch per unit effort , geography , biology , zoology , geology
Analyses are made of catch per unit of effort and length‐frequency data of over 11,000 cutlassfish trawled off Grand Isle, Louisiana in 3.5–20 fm depths. Trimodal seasonal variations in apparent relative abundance are recorded with minor modes occurring during February‐March and October‐November and a dominant spring‐summer mode from May or June through August. Smaller fish were usually most abundant at 15–20 fm depths, whereas largest size groups were most frequent at 3.5–7.5 fms. An offshore‐inshore recruitment of young fish is indicated during summer months together with an autumnal offshore migration of larger size groups. Growth, estimated from length‐frequency analyses, approximates 250 mm for 0‐class fish. Early I and II class fish may attain total lengths of 400 mm and 700 mm, respectively. Data are provided on the offshore occurrence of postlarvae and length‐weight relationships.