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Article

Length-Based Assessment Methods for the Conservation of a Pelagic Shark, Carcharhinus falciformis from the Tropical Pacific Ocean

by 1,2,3,4,5, 1, 1,2,3,4,5,* and 1,2,3,4,5,*
1
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
2
National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China
3
Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China
4
Key Laboratory of Oceanic Fisheries Exploitation, Ministry of Agriculture, Shanghai 201306, China
5
Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture, Shanghai 201306, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Fabrizio Serena, Fabio Fiorentino and Alvaro Juan Abella
Fishes 2022, 7(4), 184; https://doi.org/10.3390/fishes7040184
Received: 30 May 2022 / Revised: 22 July 2022 / Accepted: 22 July 2022 / Published: 25 July 2022
(This article belongs to the Special Issue Cartilaginous Fishes: Stock Assessment and Population Dynamics)
The silky shark, Carcharhinus falciformis is one of the most heavily exploited sharks, being the main by-catch species in both tuna longline and purse-seine fisheries in tropical waters worldwide. Despite this severe exploitation, little is known about the species’ life history and population status. Silky sharks, like many other sharks, exhibit slow growth and low fecundity, indicating the urgency of developing assessment studies to aid in the implementation of conservation plans for their stocks. Because information on the catch and effort of this species is scarce, some length-based data-limited methods were applied in the present study to provide estimates of the status of the tropical Pacific silky shark population. As evident from the LBSPR analysis, the current spawning potential ratio (SPR) was found to be below the target reference point of SPR 40% and slightly above the limit reference point of SPR 20%. In addition, the LBB model also confirmed that this stock’s status is overfished with relatively low biomass levels. Furthermore, both models showed estimates of size selectivity at 50% and 95% that were lower than the estimated size at sexual maturity. In conclusion, the data-limited models developed in this study indicated that the silky shark stock in the tropical Pacific Ocean may be at risk of further decline. Additionally, the results show that growth and recruitment overfishing may be occurring in the silky shark’s population calling for immediate intensification of monitoring programs for these sharks as a pre-requisite to develop efficient management and conservation plans in the Pacific Ocean. View Full-Text
Keywords: data-limited methods; life–history information; by-catch species; size composition data-limited methods; life–history information; by-catch species; size composition
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MDPI and ACS Style

Kindong, R.; Sarr, O.; Wu, F.; Tian, S. Length-Based Assessment Methods for the Conservation of a Pelagic Shark, Carcharhinus falciformis from the Tropical Pacific Ocean. Fishes 2022, 7, 184. https://doi.org/10.3390/fishes7040184

AMA Style

Kindong R, Sarr O, Wu F, Tian S. Length-Based Assessment Methods for the Conservation of a Pelagic Shark, Carcharhinus falciformis from the Tropical Pacific Ocean. Fishes. 2022; 7(4):184. https://doi.org/10.3390/fishes7040184

Chicago/Turabian Style

Kindong, Richard, Ousmane Sarr, Feng Wu, and Siquan Tian. 2022. "Length-Based Assessment Methods for the Conservation of a Pelagic Shark, Carcharhinus falciformis from the Tropical Pacific Ocean" Fishes 7, no. 4: 184. https://doi.org/10.3390/fishes7040184

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