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Little tuna ( Euthynnus affinis ) needs tobe managed well because even as a renewable natural resources, but can undergo depletion or extinction. One of the approach inthe management of the resources is by modelling. The analysis was performed aimingto get the best estimated for the surplus production model to determine the maximum sustainable yields (MSY), utilization level, and effort level of little tuna. The data of catch and fishing effort little tuna collected from the Marine and Fisheries Service of the North Bolaang-Mongondow Regency and the North Sulawesi Province. Best Surplus Production Model, which is used to assess the potential of little tuna is  Schaefer Model.  Optimal effort ( E msy ) of  482 trips  per year, with catchesof optimal  C msy 465.13 tons  per year. The effort level for 2017 is  114.10 % , which shows the inefficiency of effort, the utilization level of  125.99 %,  showing occur overfishing.

Determination of the status of utilization and effort of little tuna (Euthynnus affinis) caught in the North Bolaang-Mongondow waters North Sulawesi