| dc.description.abstract | Eastern Little Tuna is one of fisheries commodity that has high economic
value in Medan. This type of fish is the most demand in the local market, thus it
becomes the main target catch for fisherman. However, that activity has negative
impact for the population of Eastern Little Tuna. This study was done at KUD
Gabion on November 2014 until April 2015, and the aims were to study about the
growth pattern, growth parameter, factor condition, and also the rate of
exploitation in order to provide appropriate management model for the fish
resource. The primary data is the total length and wet weight of 371 samples of
Eastern Little Tuna, while the secondary data is the temperature of sea surface.
The cohort length of fish is separated by Bhattacarya method in FISAT II
software. The Von Bertalanffy growth parameters estimated were asymtotic
length (L∞) = 628,95 mm, growth coefficient (K) = 0,24 year-1 and the age at zero
length (t0) = -0,30 from Pauly’s empirical equation. Then, the growth equation for
Eastern Little Tuna is Lt = 628.95 (1‐e[-0.24(t+0,30)]), whereas value of b obtained
from relations of lenght – weight Eastern Little Tuna is 2,963. A growth pattern of
Eastern Little Tuna is negative allometric with an equation growth
W=0,00002L2,963. The highest and the lowest value of factor condition are 0,40
and 2,11. The rate of total mortality (Z) Eastern Little Tuna is 2,097 year-1 with
natural mortality rate (M) 0,30 year-1 and fishing mortality rate (F) 1,79 year-1 thus
the rate of exploitation is obtained with the amount 0,85 and the value of this
exploitation rate has exceeded the value of the optimum exploitation, which is 0,5. | en_US |
