ESTIMATION OF YELLOWFIN TUNA PRODUCTION LANDED IN BENOA PORT WITH WEIGHT-WEIGHT, LENGTH-WEIGHT RELATIONSHIPS AND CONDITION FACTOR APPROACHES
Abstract: Yellowfin tuna
(Thunnus albacares) is one of the important catch for the fishing industry in
Indonesia. Length-weight relationship study is one of important tools to support
fisheries management. However it could not be done to yellowfin tuna landed in
Benoa port since they are in the form of gilled-gutted condition. The
objectives of this study are to determine the relationship between
gilled-gutted weight (GW) and whole weight (WW), to calculate length weight
relationship between fork length (FL) and estimated whole weight (WW) and to
assess the relative condition factor (Kn) of yellowfin tuna in Eastern Indian
Ocean. Data were collected from three landing sites i.e. Malang, East Java;
Benoa, Bali and Kupang, East Nusa Tenggara from January 2013 to February 2014.
Linear regression analysis applied to test the significance baseline between
weight-weight relationships and log transformed length weight relationship.
Relative condition factor (Kn) used to identify fish condition among length
groups and months. The results showed a significant positive linear
relationships between whole weight (WW) and gilled-gutted weight (GW) of T.
albacares (p<0.001). There was a significant positive linier relationships
between log transformed fork length and log transformed whole weight of T.
albacares (p<0.001). Relative condition factor (Kn) showed declining pattern
along with length increase and varied among months. The findings from this study
provide data for management of yellowfin tuna stock and population.
Keywords: Weight-weight
relationships; length-weight relationships; condition factor; yellowfin tuna;
Eastern Indian Ocean
Author: Irwan Jatmiko, Hety
Hartaty, Budi Nugraha
Journal Code: jpperikanangg160059
