Abstract
This contribution presents stock assessments for ten fish and two squid populations exploited by Chinese, South Korean and Japanese fishing fleets in the Tsushima Warm Current region, i.e., West of Japan and East of China. The methods used are a Monte Carlo method (CMSY) and a Bayesian state-space implementation of the Schaefer model (BSM), based on published time series of catch and abundance data (SSB and CPUE). Results show that two fish stocks, Japanese jack mackerel (Trachurus japonicus) and yellowback sea-bream (Dentex hypselosomus) are in a healthy status, while daggertooth pike conger (Muraenesox cinereus) appears to have collapsed. The other nine stocks show varying degrees of overfishing. The cooperation of several countries will be required to recovery the fishery resources in the Tsushima Warm Current region.
Highlights
The capture production (FAO catalog: Fish, crustaceans, molluscs, etc.) in the Northwest Pacific Ocean (No 61 fishing area, FAO) accounted for 20.2% of the world total marine capture in 2017 (FAO, 2019)
We applied the CMSY and BSM methods to 12 fishery stocks distributed in the Tsushima Warm Current region
The BMSY of T. japonicus was above 500,000 tonnes, and the stocks with BMSY > 1,000,000 tonnes included chub mackerel (S. japonicus), South American pilchard (S. melanostictus), and back scraper (T. modestus)
Summary
The capture production (FAO catalog: Fish, crustaceans, molluscs, etc.) in the Northwest Pacific Ocean (No 61 fishing area, FAO) accounted for 20.2% of the world total marine capture in 2017 (FAO, 2019). The management of exploited fishery stocks in this region requires a knowledge of stock status and relevant reference points that can be used in formulating fishery management policies. This kind of information is usually deficient or inadequate, especially for datalimited stocks (Froese et al, 2012). In response to severe depletions of fishery resources, neighboring countries of the Northwest Pacific Ocean, such as Japan, South Korea, and China, have intervened with a series of fishery management strategies. In Japan, a total allowable catch (TAC) system was introduced by the
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