selectivity of gill nets for solea solea (osteichthyes: soleidae) in the adriatic sea
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ID: 234385
2008
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Abstract
Sole juveniles concentrate along the western Adriatic coast where they are targeted from spring to autumn by small-scale gill netters. As in spring–early summer 20 to 30% of catch biomass consists of individuals smaller than MLS (TL = 20 cm), the selectivity of sole gill nets was investigated in 2004-2005 in order to obtain useful information for developing management measures aimed at reducing the retention of undersized specimens and assuring the sustainability of this fishery. Twenty-eight fishing trips were performed using sole gill nets with 5 mesh openings (64.2, 65.2, 67.8, 70.2 and 71.8 mm) simultaneously. The gill net selectivity was estimated indirectly by applying the SELECT method and between-set analysis. The log-normal curve was found to fit single set data better than other models. The catch yields did not significantly decrease with the increment of mesh size: the biomass of undersized individuals in catches noticeably decreased from 16% down to 9% in the largest mesh size, whilst the sole that were longer than the MLS increased proportionally. In view of the lower economic value of smaller specimens with respect to the larger ones, adopting the 71.8 mm mesh represents a good compromise between the need to protect juveniles and the economic profit of gill netters.
| Reference Key |
fabi2008scientiaselectivity
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|---|---|
| Authors | ;Gianna Fabi;Fabio Grati |
| Journal | Nutrients |
| Year | 2008 |
| DOI |
10.3989/scimar.2008.72n2253
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