Assessment of some biological aspects of yellowfin tuna (Thunnus albacares) in Dilasag bay, Dilasag, Aurora, Philippines

Abstract

The study was conducted to assess the biological aspects of yellowfin tuna (Thunnus albacares) caught using hook and line in Dilasag Bay, Dilasag, Aurora, Philippines from July to September 2019. A total of 283 yellowfin tuna (total weight of 12,231.53 kg) was caught in Dilasag Bay by the 10 municipal fishermen in their 283 fishing trips. Large size yellowfin tuna (>110 cm) were commonly caught in Dilasag Bay. The monthly and combined growth data of the fish was described as negative allometric (b <3); the organism grows slender, so it gains length faster than weight. The length-weight relationship equation for the combined catches was W = 2.240 L 1.129 . The over-all value of condition factor (K), growth rate constant (k) and maximum length (L∞) of yellowfin tuna were 1.88±0.12, 0.157 kg/year and 145.117 cm, respectively.