Abstract
Determination of utilization level and effort level of scad mackerel (Decapterus spp) are very important to know the status of fisheries management. This fish needs to be managed well because even as a renewable natural resources, but can undergo depletion or extinction. One of the approach in the management of fish resources is by mathematics modeling. In this research using Surplus Production Model (SPM) with 5 estimator methods, that are: Schaefer, Fox, Schnute, Walter-Hilborn, and Clarke Yoshimoto Pooley. The analysis was performed aiming to get the best estimate for the surplus production model to determine the maximum sustainable yields (MSY), utilization level, and effort level of scad mackerel. The criteria of the best model (estimator) are: sign suitability of regression equation, value of coefficient determination, validation values (residual), and significance of regression coefficients. From the best model by using the formula can be determined the maximum sustainable yields (MSY) of catching, utilization level, and effort level. The data of catch and fishing effort of scad mackerel collected from the Marine and Fisheries the Bitung City and North Sulawesi Province from 1998 - 2016. The best SPM, which is used to assess the potential of scad mackerel is Schaefer Model. Optimal effort (EMSY) of 4,449 trips per year, with catch of optimal CMSY19,793.601 tons per year. The effort level for 2014 is 86.58%, which shows the quite efficient effort, the utilization level of 73.10% showing the production still can be increased.
Highlights
Mackerel scad (Decapterus spp) classified as important pelagic fisheries resources and one of the non-oil export commodity in North Sulawesi
This study aims to get the best Surplus Production Model (SPM), as well as knowing how much the result of maximum sustainable yields (MSY), John Socrates Kekenusa et al.: Determination of the Utilization and Effort Level of Mackerel
The primary and secondary data of mackerel scad catching is collected from the Bitung waters
Summary
Mackerel scad (Decapterus spp) classified as important pelagic fisheries resources and one of the non-oil export commodity in North Sulawesi. Mackerel scad production in North Sulawesi (including Bitung waters) in 2016 reach 50,000 tons per year, with a value of about 100 billion rupiahs [1]. Research on mackerel scad generally discusses the exploitation to increase production, not much research on the status of utilization (including aspects of sustainability and efficiency) resources. Catching mackerel scad in Bitung waters has lasted long enough, with high intensity. Data on the level of utilization of the fish resources are very important, as it will determine whether the resource use is less than optimal, optimal, or excessive. By knowing the level of resource utilization on the mackerel scad, is expected to be done in a planned and sustainable management
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