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Temperature effects on life-history traits cause challenges to the management of brachyuran crab fisheries in the Humboldt Current: a review

Temperature effects on life-history traits cause challenges to the management of brachyuran crab fisheries in the Humboldt Current: a review
Temperature effects on life-history traits cause challenges to the management of brachyuran crab fisheries in the Humboldt Current: a review
Owing to the influence of the Humboldt Current many cold-water adapted brachyuran crabs of commercial interest have vast (>40°latitude) distributional ranges along the Pacific Coasts of Peru and Chile. Development of artisanal diving and trapping fisheries on these crabs (mainly Cancridae and Xanthidae) is either uncontrolled (Peru) or existing management measures, like the minimum landing size of 12 cm carapace width, and the prohibition to catch ovigerous females, are poorly enforced (Chile). Under El Niño conditions, occurring on average every 4 years, the upper temperature limit of these temperate species can be exceeded in Peru, leading to mass mortalities of adult crabs and a breakdown of the artisanal crab fishery. Temperature changes (latitudinal or in the course of El Niño Southern Oscillation) may have pervasive effects on reproduction and early life history stages as represented for Romaleon setosus, which ultimately determine the recruitment of crabs to the fishery. The recent development of the fishery, namely the decline of the landings of Romaleon setosus and Homalaspis plana in Central- to Northern Chile, compensated by the rapidly developing fishery on Metacarcinus edwardsii in Southern Chile is presented and discussed in the light of temperature effects on the crabs’ (reproductive) biology. We conclude that an enforcement of the legal minimum size is needed to allow for a sustainable fishery of both species throughout their distribution range.
Metacarcinus edwardsii, Romaleon setosus, Homalaspis plana, El Niño, Latitudinal cline, Chile, Peru
0165-7836
461-468
Fischer, Soenke
03220399-2d15-4d7b-aaa7-2ad4766fff84
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Fischer, Soenke
03220399-2d15-4d7b-aaa7-2ad4766fff84
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533

Fischer, Soenke and Thatje, Sven (2016) Temperature effects on life-history traits cause challenges to the management of brachyuran crab fisheries in the Humboldt Current: a review. Fisheries Research, 183, 461-468. (doi:10.1016/j.fishres.2016.07.008).

Record type: Article

Abstract

Owing to the influence of the Humboldt Current many cold-water adapted brachyuran crabs of commercial interest have vast (>40°latitude) distributional ranges along the Pacific Coasts of Peru and Chile. Development of artisanal diving and trapping fisheries on these crabs (mainly Cancridae and Xanthidae) is either uncontrolled (Peru) or existing management measures, like the minimum landing size of 12 cm carapace width, and the prohibition to catch ovigerous females, are poorly enforced (Chile). Under El Niño conditions, occurring on average every 4 years, the upper temperature limit of these temperate species can be exceeded in Peru, leading to mass mortalities of adult crabs and a breakdown of the artisanal crab fishery. Temperature changes (latitudinal or in the course of El Niño Southern Oscillation) may have pervasive effects on reproduction and early life history stages as represented for Romaleon setosus, which ultimately determine the recruitment of crabs to the fishery. The recent development of the fishery, namely the decline of the landings of Romaleon setosus and Homalaspis plana in Central- to Northern Chile, compensated by the rapidly developing fishery on Metacarcinus edwardsii in Southern Chile is presented and discussed in the light of temperature effects on the crabs’ (reproductive) biology. We conclude that an enforcement of the legal minimum size is needed to allow for a sustainable fishery of both species throughout their distribution range.

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More information

Accepted/In Press date: 4 July 2016
Published date: 20 July 2016
Keywords: Metacarcinus edwardsii, Romaleon setosus, Homalaspis plana, El Niño, Latitudinal cline, Chile, Peru
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 397717
URI: http://eprints.soton.ac.uk/id/eprint/397717
ISSN: 0165-7836
PURE UUID: 581f57de-ef79-4194-8bfb-61f7fa44e1dc

Catalogue record

Date deposited: 04 Jul 2016 10:11
Last modified: 08 Jan 2022 15:37

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Contributors

Author: Soenke Fischer
Author: Sven Thatje

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