Mesh size selectivity of surface and mid - water gillnet for catching freshwater sardines Sardinella tawilis (Herre,1927) in Taal Lake, Philippines 6
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Contributor(s): The Philippine Journal of Fisheries.25(2): pp.27-40 5 6 [] |
Language: Unknown language code Summary language: Unknown language code Original language: Unknown language code Series: ; 46Edition: Description: Content type: text Media type: unmediated Carrier type: volumeISBN: ISSN: 2Other title: 6 []Uniform titles: | | Subject(s): -- 2 -- 0 -- -- | -- 2 -- 0 -- 6 -- | 2 0 -- | -- -- 20 -- | | -- -- OPTIMUM MESH SIZE;SUSTAINABVLE EXPLOITATION -- SELECTIVITY;GILL NET -- ENDEMIC -- | -- -- -- 20 -- --Genre/Form: -- 2 -- Additional physical formats: DDC classification: | LOC classification: | | 2Other classification:| Item type | Current location | Home library | Collection | Call number | Status | Date due | Barcode | Item holds |
|---|---|---|---|---|---|---|---|---|
| Book | PLM | PLM Periodicals Section | Periodicals | SH1 .P538.2018 (Browse shelf) | Available | PER1940D |
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ABSTRACT : Technical information on the mesh size selectivity for tawilis fishery in Taal Lake is presently unknown or undocumented and different mesh size z off gillnets are employed to exploit the species at various sizes. The study investigated the mesh size selectivity involving gillnet for Sardinella tawilis using four different mesh sizes : 3.39cm (11k), 2.77cm (12k) and 2.65. Fishing trials were conducted in Taal lake Philppines from October 2014 to September 2015. A total of 4,456 pieces of S.tawilis were caught with the length ranges from 8.5 cm to 14.5 cm mid-lenght. The seasonal changes in the gonadosomatic index (GSI) showed that S Tawilis apwans between March - May and August. Length at 50% maturity (L50) was estimated at 11.6 cm and used as the criterion for selecting the appropriate mesh size. The optimal length for each mesh size was estimated employing the Baranov-Holt method. The estimated optimal lenghts of S. Tawilis were estimated at 10.6 cm, 11.08 cm and 14.53 cm for the mesh sizes of 12.5k ,12k, 11kk, and 10k, respectively. Hence the appropriate gillnet mesh size for S. Tawilis corresponding to length at 50% maturity was 3.05 cm (11K). 56
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