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Impacts of fisheries on elasmobranch reproduction: high rates of abortion and subsequent maternal mortality in the shortnose guitarfish

Citation

Wosnik, N and Awruch, CA and Adams, KR and Gutierre, SMM and Bornatowski, H and Prado, AC and Freire, CA, Impacts of fisheries on elasmobranch reproduction: high rates of abortion and subsequent maternal mortality in the shortnose guitarfish, Animal Conservation pp. 1-9. ISSN 1367-9430 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 The Zoological Society of London

DOI: doi:10.1111/acv.12458

Abstract

The fate of bycatch species released back into the water is crucial to estimate population status and consequent decisions to implement adequate management measurements for elasmobranchs. The shortnose guitarfish, Zapteryx brevirostris, is an endemic species of the Southwest Atlantic. It is currently listed as ‘Vulnerable’ both in the International Union for Conservation of Nature and Brazilian red lists. Although this species displays high tolerance to capture and transportation by fishers from the capture site to the fish market, a significant reduction in survival rates is observed during the reproductive period. Thus, the aim of the present study was to examine post‐capture and post‐commercial transportation consequences in pregnant females obtained as bycatch from artisanal fisheries in Southern Brazil. Results showed high abortion rates and reduced maternal survival after abortion, with all abortions occurring within 28 h of monitoring in laboratory. Stress plasma markers were also evaluated, to determine the physiological consequences of capture‐induced parturition to pregnant females. Results showed alteration in all markers measured (plasma urea, pH, lactate, phosphorus, and potassium) with values for dead pregnant females being different from non‐pregnant females and those which survived capture and subsequent abortions. The mortality caused by fisheries bycatch may prove difficult to manage, with immediate release and specific handling protocols for pregnant females implemented through environmental education environmental education and fishermen training programs, potential options to maintain adequate maternal survival and recruitment for this species.

Item Details

Item Type:Refereed Article
Keywords:batoids, reproductive disruption, fishing stress, conservation physiology, bycatch, Zapteryx brevirostris, bycatch mortality
Research Division:Biological Sciences
Research Group:Physiology
Research Field:Animal Physiology - Systems
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
UTAS Author:Awruch, CA (Dr Cynthia Awruch)
ID Code:131069
Year Published:2018
Deposited By:Zoology
Deposited On:2019-02-28
Last Modified:2019-03-15
Downloads:0

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