Mesh size selectivity of surface and mid-water gillnet for catching freshwater sardines “Sardinella tawilis” (Herre, 1927) in Taal Lake, Philippines / Elmer B. Alba, Marnelli C. Rubia and Marco A. Perez
Material type: ArticlePublisher: Quezon City, Philippines : Bureau of Fisheries and Aquatic Resources , 2018Content type:- text
- computer
- online resource
- 2672-2836 (Online)
Item type | Current library | Collection | Call number | Vol info | Status | Date due | Barcode | |
---|---|---|---|---|---|---|---|---|
Journal Article | NFRDI Central Office NFRDI KMRC Indexed Materials Collection | Electronic | Volume 25, Issue no. 2 (July - December 2018), page 27 - 40 | Available | IMC000200 | |||
Journal | NFRDI Central Office NFRDI KMRC Institutional Repository Collection | Electronic | SH 1 .B9524 2018 vol. 25 no. 2 (Browse shelf(Opens below)) | Volume 25, No. 2 (July - December 2018) | Available | IRC00034 |
Includes bibliographical references
Technical information on the mesh size selectivity for tawilis fishery in Taal Lake is presently unknown or undocumented and different mesh sizes of gillnets are employed to exploit the species at various sizes. The study investigated the mesh size selectivity involving gillnet fishery for Sardinella tawilis using four different mesh sizes: 3.39 cm (10k), 3.05 cm (11k), 2.77 cm (12k), and 2.65 cm (12.5k). Fishing trials were conducted in Taal Lake, Philippines 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-length. The seasonal changes in the gonadosomatic index (GSI) showed that S. tawilis spawns between March-May and August. Length at 50% maturity (L50) was estimated at 11.66 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 lengths of S. tawilis were estimated at 10.6 cm, 11.08 cm, 13.07 cm, and 14.53 cm for the mesh sizes of 12.5k, 12k, 11k, and 10k, respectively. Hence, the appropriate gillnet mesh size for S. tawilis corresponding to length at 50% maturity was 3.05 cm (11k).
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