LENGTH-WEIGHT RELATIONSHIP, SIZE DISTRIBUTION AND ANNUAL CPUE’s OF ALBACORE IN EASTERN INDIAN OCEAN
Abstract: Albacore (Thunnus
alalunga, Bonnaterre, 1788) is one of the tropical tuna species in the Eastern
Indian Ocean incidentally caught by the Indonesian tuna longliner. Scientific
observer series data during the period of 2005 – 2012 showed that the catches were
geographically distributed within the area bordered by 5 – 350 S and 75 – 1300
E. High CPUE mainly occurred in sub area between 250 and 350 S. Some biological
observations indicated that immature albacore specimens were mainly recorded in
areas of south of 250 S while mature albacore were concentrated in the area
between 100 S and 250 S. Length – weight measurements for pooled male and
female was W= 0.00008FL2.7271. The hook-rates from onboard observation showed
that increasing rates occurred during 2009 to 2012. The annual landing showed
that that highest occurred in 2008 and the lowest in 2011 with overall tend to
decrease until 2011 and increased slightly in 2012. Series number of length
frequency measurements (2005 - 2012) showed that the albacore were caught
within the range of 40 – 135 cm FL and there was a tendency that the average
size decreased gradually from 103 cmFL (2005) to 84 cmFL (2012). As a
preliminary finding these estimates contribute as important element for
consideration in the national and regional tuna fisheries management in the
area.
Keywords: Scientific observer;
length-weight relationship; size distribution; hook-rates
Author: Bram Setyadji, Budi
Nugraha, Duto Nugroho
Journal Code: jpperikanangg140035
