Abstract
Globally, marine fisheries have declined under multiple stresses including overfishing, climate change, and habitat degradation. The Min River Estuary, as the largest estuary in southeastern China, has confronted this situation over recent decades. In this study, the dominant species of fish stocks in the Min River Estuary, including Coilia mystus, Cynoglossus abbreviates, Collichthys lucidus, Amblychaeturichthys hexanema, Polydactylus sextarius, Harpodon nehereus, and Secutor ruconius, were evaluated by the length-based Bayesian biomass estimator method (LBB). Outcomes could be grouped into three categories as healthy, showing the lowest exploitation rate (E: 0.31–0.43) and highest relative biomass (B/Bmsy: 1.30–1.90), including S. ruconius, C. mystus, and H. nehereus; overfished, with a medium E (0.50–0.58) and B/Bmsy (0.68–0.79), including A. hexanema and C. abbreviates; and collapsed, with the highest E (0.89–0.92) and lowest B/Bmsy (0.03–0.21), including C. lucidus and P.sextarius. Corresponding imperative countermeasures such as using larger-sized mesh gears and reducing fishing intensity should be deployed according to the current status of each species for sustainable fishery exploitation and fish conservation.
Highlights
Worldwide fisheries are severely damaged under overfishing [1], and higher requirements have been put forward for stock management [2]
The reasonable estimation of resource exploitation and reliable stock assessment of target fish species are greatly encouraged in rebuilding the fishery resources
The model firstly estimated the asymptotic length (L∞ ), the length where 50% of the fish were captured (Lc ), M/K, and F/K
Summary
All animal experimental procedures used in this study were approved by the Animal Care and Ethics Committee of the Ocean University of China. The Min River Estuary, located in the east of Fujian Province at a range of latitude and longitude 119◦ 300 0000 –120◦ 000 0000 (Figure 1), is the largest in southeastern. Fish samples were collected by a commercial fishing vessel through a benthic trawling net with a mesh size of 25 mm. A total of 11 stations were set up (Figure 1), and trawling lasted approximately 30 min per station at an average speed of three knots. The collected fishes were identified to the lowest taxonomic level according to ‘The Fishes of Fujian Province’ [25].
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