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A combined telemetry - tag return approach to estimate fishing and natural mortality rates of an estuarine fish

Canadian Journal of Fisheries and Aquatic Sciences

By:
, , , , and
DOI: 10.1139/F09-076

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Abstract

A joint analysis of tag return and telemetry data should improve estimates of mortality rates for exploited fishes; however, the combined approach has thus far only been tested in terrestrial systems. We tagged subadult red drum (Sciaenops ocellatus) with conventional tags and ultrasonic transmitters over 3 years in coastal North Carolina, USA, to test the efficacy of the combined telemetry - tag return approach. There was a strong seasonal pattern to monthly fishing mortality rate (F) estimates from both conventional and telemetry tags; highest F values occurred in fall months and lowest levels occurred during winter. Although monthly F values were similar in pattern and magnitude between conventional tagging and telemetry, information on F in the combined model came primarily from conventional tags. The estimated natural mortality rate (M) in the combined model was low (estimated annual rate ?? standard error: 0.04 ?? 0.04) and was based primarily upon the telemetry approach. Using high-reward tagging, we estimated different tag reporting rates for state agency and university tagging programs. The combined telemetry - tag return approach can be an effective approach for estimating F and M as long as several key assumptions of the model are met.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A combined telemetry - tag return approach to estimate fishing and natural mortality rates of an estuarine fish
Series title:
Canadian Journal of Fisheries and Aquatic Sciences
DOI:
10.1139/F09-076
Volume
66
Issue:
8
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Journal of Fisheries and Aquatic Sciences
First page:
1230
Last page:
1244
Number of Pages:
15