Abstract
In the present study, an attempt was made to quantify hook selectivity of two carangid species (Caranx ignobilis and Carangoides gymnostethus) which were predominantly caught in the hook-and-line fishery off Negombo, Sri Lanka. As the length frequency data of C. ignobilis and C. gymnostethus recorded by hook size were skewed towards the larger fish, a modification of Baranov-Holt method for gillnet selection was employed. For both species there were positive significant relationships (p<0.001) between the hook size and optimal length while selection range was negatively related to hook size (p<0.001). DOI: http://dx.doi.org/10.4038/sljas.v16i0.6712 Sri Lanka J. Aquat. Sci. 16 (2011): 11-26
Highlights
Fisheries scientists often rely on the analysis of size/age composition of commercial catches for fish stock assessment
C. gymnostethus caught in hook sizes of mm, mm, mm and mm were used in the present analysis
As one of the assumptions of the Baranov-Holt method of estimating gillnet selection was that two adjacent mesh sizes would impose similar fishing mortalities, in the modified approach employed in the present study, length frequency distribution of fish in each hook size was used as number of fish per 100 hooks
Summary
Fisheries scientists often rely on the analysis of size/age composition of commercial catches for fish stock assessment. Due to gear selectivity the commercial catch samples do not represent actual size or age structure of fish populations. Knowledge about the selection characteristics of fishing gear is important for meaningful assessment of fish stocks (Sparre and Venema 1998). Many studies have shown that length frequency samples derived from angling (Fry 1949), hook-and-line fisheries (Leclere and Power 1980) and longline fisheries (Koike and Kanda 1978; Erzini et al 1997) exhibit dome-shaped selectivity patterns, somewhat similar to those obtained from gillnets (Baranov 1914; Holt 1963; Hamley 1975). Chatwin (1958) reported that the hook selectivity curves of lingcod (Ophiodon elongates)
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