Assessment of the fisheries resources of Carigara Bay [Samar, Philippines]
1999
Pura, L.R. | Cinco, E.A. | Sia, Q.P. III | Alducente, F.C. | Ayon, M.J.N. | Balleta, G.F. | Enerlan, A.R. | Llevado, B.E. | Lumagod, F.B.
This study is an update of the capture fisheries assessment of the Carigara Bay Resource and Ecological Assessment. Carigara Bay is characterized by a highly diversified multispecies fishery resource being exploited by a multiplicity of fishing gears. A total of 34 fishing gears, 13 of which were not included in the Carigara Bay REA have been sampled. A total of 280 fish species identified distributed among 147 genera and 55 families, and 8 invertebrate species belonging to 2 classes and 66 families, and 33 invertebrate species. The total annual fish production of the Bay was estimated at 7,706 t indicating a decline from about 9,841 t. Of the 34 fishing gears, the Danish seine (24.9%) has the major contribution in the estimated annual production. This is followed by the bottom set gill net (21.0%), fish trap/fish pot (16.8%), multiple handline (12.1%), drift gill net (10.1%), ring net (9.7%), and jigger (2.2%) with the Danish seine constituting around 97% of the landed catch in the Bay. Eight trawl fishing stations were fished on a monthly basis using a 85-hp baby trawler operating in the area. Forty valid hauls from 10 trawl trips were sampled. Mean catch rate was 12 kg/hr and the catch consisted of 60 species/group distributed among 31 families. The growth parameters (L sub ao and k) of the von Bertalanffy growth formula and mortality coefficients (M, F, and Z) were also estimated using ELEFAN 1 and 2 routine of FiSAT, for the most abundant species comprising the catch during the trawl survey. High growth rates (K = 0.55-1.40) and high mortality coefficients (Z = 3.96-7.37) were obtained for the species analyzed. These values indicate a very high turnover rate for the trawlable biomass of the Bay. Recruitment patterns derived are bimodal in most sampled species. The exploitation ratios (E) ranged from 0.50 to 0.64. Mean stock density and biomass using the swept area method was about 1.04 t-sq km and 533.5t, respectively. Compared with the previous studies, a 67% decline in the density and biomass of the level reported in 1980 was indicated. This implies a heavy fishing pressure on the fishery resources in Carigara Bay
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