Abstract
Length-weight relationships (LWR) and condition factors (K) were determined for two neritic tuna species Euthynnus affinis and Thunnus tonggol, caught in Sarawak waters. Specimens were collected from five locations around Sarawak between 2016-2019. The r2 value of the LWR for each species re both close to 1 (>0.9), indicating a highly significant relationship attributed to the length and weight of the fish species . The K values are 1.94 and 1.97, and the values of b in the LW equation are 2.53 and 2.59 for E. affinis and T. tonggol, respectively. The b<3 values indicates negative allometric growth patterns, where the growth rate of body length is faster than the weight gain. These values fall within the published range of 2.50 to 3.50 for neritic tuna species in the region. The results of this study provide the basic life history parameters and the general condition of the two species, E. affinis and T. tonggol, useful for our tuna fish stock assessment efforts in Sarawak waters.
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