Estimate of Cetacean and Shark Depredations in the Small-Scale Longline Fishery in the Southeastern Waters of Taiwan-Reference-Cited by-同舟云学术

Estimate of Cetacean and Shark Depredations in the Small-Scale Longline Fishery in the Southeastern Waters of Taiwan

Published:2023-06-15 Issue:6 Volume:11 Page:1233
ISSN:2077-1312
Container-title:Journal of Marine Science and Engineering
language:en
Short-container-title:JMSE

Author:

Liu Kwang-Ming¹²³^ORCID,Su Kuan-Yu¹,Chin Chien-Pang⁴

Affiliation:

1. Institute of Marine Affairs and Resource Management, National Taiwan Ocean University, Keelung 20224, Taiwan

2. George Chen Shark Research Center, National Taiwan Ocean University, Keelung 20224, Taiwan

3. Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung 20224, Taiwan

4. Fisheries Research Institute, Council of Agriculture, 199 Heyi Road, Keelung 20224, Taiwan

Abstract

Cetacean and shark depredations in a small-scale longline fishery in the southeastern Taiwan waters were estimated based on interviews of 21 fishermen and logbooks of 12 sampling vessels, including 649 operations (681,310 hooks) from October 2009 to December 2010. Cetacean depredations were more serious than shark depredations, with damage rates of 19.26% and 11.56%, respectively. The depredation rates in number and weight from cetaceans were estimated to be 2.21% and 3.23%, respectively, and were significantly higher than those from sharks, which were estimated to be 0.51% and 0.47%, respectively. The depredation indices from cetacean and shark were estimated to be 0.93 and 0.22 per 1000 hooks, respectively. The dolphinfish and yellowfin tuna were the top two species depredated by cetaceans and sharks. The annual economic loss of the small-scale longline fishery due to cetacean and shark depredations was estimated to be USD 441.9 thousand and USD 58.8 thousand, respectively, which corresponded to 4.5% and 0.6% of the total sales of the longline fishery at Hsinkang fishing port, southeastern Taiwan. The catch in number of dolphinfish and the operation depth were significant factors that affected cetacean depredations.

Publisher

MDPI AG

Subject

Ocean Engineering,Water Science and Technology,Civil and Structural Engineering

Link

https://www.mdpi.com/2077-1312/11/6/1233/pdf

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