| dc.description.abstract | Highly market demand on Mackerel fish (Rastrelliger spp.) effected
overfishing without controling by fishermen. This study was done from Maret
until July 2016, and the aims were to study about the growth pattern, condition
factor, growth parameter, and also potential of sustainable prediction of Mackerel
fish to provide appropriate management model for the fish resource. The primary
data is 442 samples Mackerel fish were observed, while the secondary data is
catches data and fishing effort of Mackerel last 10 years and temperature of sea
surface. Data were processed using software FISAT II. The growth pattern of
Mackerel total is positive allometric. The range of condition factor are 0,58 –
3,10. The Von Bertalanffy growth parameters estimated were asymtotic length
(L∞) = 220,50 mm, growth coefficient (K) = 1,30 year-1 and the age at zero length
(t0) = -0,426. The rate of total mortality (Z) Mackerel fish is 2,564 year-1 with
natural mortality rate (M) 1,249 year-1 and fishing mortality rate (F) 1,315 year-1
thus the rate of exploitation is obtained with the amount 0,513 and the value of
this exploitation rate has exceeded the value of the optimum exploitation, which is
0,5. Potential estimation sustainable use of fish Mackerel Fox models. The
potential of sustainable prediction was performed with Fox model. Value
Maximum Sustainable Yield (MSY) Mackerel fish was 6,276,538.129 kg / year
with optimum effort was 7939.647596 trips / year. Average utilization rate of
70,39% with an average insistence rate (TAC) of 179,49%, while allowable catch
150,1587365 kg/year. Based on the value of MSY and optimum effort Mackerel is
known that fish are already experiencing overfishing. While based on average
utilization rate, Mackerel fish in Belawan waters was still in a condition of solid
catch. | en_US |
