Stock Assessment of Tuna Fishes in Major Tuna Fishing Grounds of Ilocos Sur

Abstract

This study attempted to find out the seasonal and spatial distributions of two tuna species, Thunnus albacare s (yellowfin) and Katsuwonus pelamis (skipjack or bluefn) in the Province of
1locos Sur, focusing its investigation on three variables: a) number of fishes caught per fishing effort, b) total weight ot fishes caught per fishing effort and c) price per kilo. Three collecting stations were selected based on the reports of the fishing municipalities: Station 1 - Puro,
Magsingal; Station 2 - Villamar, Caoayan and San Pedro, Vigan, and Station 3 - NaNvo, Santa Maria. Results showed that there are no differences in the seasonal distribution of tuna fishes in llocos Sur., Tuna fishes abound throughout the province the whole year round. There are, however, significant differences in the spatial distribution of tuna fishes. More and heavier fishes are caught in Station 1 that Stations 2 and 3. Prices are also cheaper in Station 1 than Stations 2 and 3. Recommendations are given by the researcher for the proper management of the resource.