Descender Devices are Promising Tools for Increasing Survival in Deepwater Groupers

Runde, Brendan J.; Buckel, Jeffrey A.

doi:10.1002/mcf2.10010

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i

Descender Devices are Promising Tools for Increasing Survival in Deepwater Groupers

2018
By Runde, Brendan J. ; Buckel, Jeffrey A.
Source: Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 10(2), 100–117

[PDF-2.10 MB]

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Details:

Journal Title:

Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science
Personal Author:

Runde, Brendan J. ; Buckel, Jeffrey A.

Runde, Brendan J. ; Buckel, Jeffrey A. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SER (Southeast Region)

NMFS (National Marine Fisheries Service) ; SER (Southeast Region) Less -
Description:

Discard survival of deepwater (>60 m) groupers (Serranidae; Epinephelinae) is often assumed to be 0% given the severity of barotrauma and the inability of fish to submerge. We used acoustic telemetry to study the activity of 19 deepwater grouper after a recompressed release with a descender device, achieved by rapidly returning fish to a depth where expanded gases can contract. The species tested were the Scamp Mycteroperca phenax (n = 8), Snowy Grouper Hyporthodus niveatus (n = 7), and Speckled Hind Epinephelus drummondhayi (n = 4). Individuals of all three species showed post‐recompression variation in water depth and acceleration indicative of survival, whereas information from other tags indicated discard mortality. Nonparametric Kaplan–Meier survivorship procedures yielded a 14‐d survival estimate of 0.50 (95% confidence interval = 0.10–0.91); although low, this estimate is higher than the currently assumed 0% survival. Additionally, our estimate of discard survival is likely biased low because we assumed that no individuals shed their tag, which is unlikely for our attachment method. A technique to increase discard survival of deepwater groupers may lead to better‐constructed regulations for reef fishes in the southeastern USA and in other areas where these species are caught and released.
Keywords:

[+]

Effect Of Fishing On Fishery Discards Groupers Mortality
Source:

Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 10(2), 100–117
DOI:

https://doi.org/10.1002/mcf2.10010
Document Type:

Journal Article
Funding:

Grant no. NA14NMF4540061
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:235ef90a0ccdb25c7a79e2fd30c8b21715690e82bfe21a9598de89cb8b5bf7c5
Download URL:

https://repository.library.noaa.gov/view/noaa/24638/noaa_24638_DS1.pdf
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