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Effects of Trap Density and Diel Harvesting Frequency on Catch of Crawfish
Author(s) -
Romaire Robert P.,
Pfister Ver A.
Publication year - 1983
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8659(1983)3<419:eotdad>2.0.co;2
Subject(s) - diel vertical migration , hectare , nocturnal , fishery , dusk , environmental science , zoology , procambarus clarkii , trap (plumbing) , fishing , biology , trapping , population density , ecology , population , crayfish , environmental engineering , agriculture , demography , sociology
The relationship of trap density and diel (24‐hour) harvest frequency to catch of crawfish (Procambarus clarkii and Procambarus acutus acutus) was evaluated in a 20‐hectare commercial crawfish pond. The catch of crawfish in the baited traps at 100, 75, and 50 traps per hectare was 3.3, 2.8, and 1.6 times greater, respectively, than at 25 traps per hectare (standard commercial density). Two 6‐hour trapping intervals per 24 hours caught 1.2, 1.9, 2.0, and 2.1 times more crawfish than did three 4‐hour, one 12‐hour diurnal, one 12‐hour nocturnal, and one 24‐hour trapping interval, respectively. A maximum catch of crawfish was obtained by fishing 100 traps per hectare three times (two 6‐hour diurnal sets plus one 12‐hour nocturnal set) per 24 hours. Crawfish catch was lowest at 25 traps per hectare with traps emptied once every 24 hours.