Bottom Currents Affect Spanner Crab Catch Rates in Southern Queensland, Australia

Loading...
Thumbnail Image
File version
Version of Record (VoR)
Author(s)
Spencer, David M
Brown, Ian W
Doubell, Mark J
McGarvey, Richard
Lee, Shing Y
Lemckert, Charles J
Primary Supervisor
Other Supervisors
Editor(s)
Date
2019
Size
File type(s)
Location
License
http://creativecommons.org/licenses/by/4.0/
Abstract

During daily fishing operations, spanner crab Ranina ranina catch rates can fluctuate substantially, but the environmental drivers responsible for these fluctuations largely remain unresolved. Earlier research suggests that spanner crab catchability increases with strengthening currents, but uncertainties surround the magnitude of the measured current speeds and, consequently, their relationship with catch rates. Here, we explore the effects of bottom currents on spanner crab catch rates in South East Queensland, Australia. Using generalized additive mixed modeling, our results indicated that strengthening current speeds increased catch rates until reaching approximately 0.15 m/s, at which point the catch rates began to gradually decline. Results from a general linear regression model also showed that between fishing periods carried out on the same day, catch rates increased or decreased concurrently with current speeds. We conclude that bottom current speed should be considered in future stock assessment models. Better understanding the processes responsible for changes in bottom current speed will enable more accurate estimates of spanner crab population densities in the Australian fishery and will benefit the economic efficiency of commercial crabbing operations. Furthermore, future studies that investigate the effects of current speed on catch rates for other crab species should consider differences in locomotory characteristics and how they may impact the foraging efficiency of crabs under different flow conditions.

Journal Title
Marine and Coastal Fisheries
Conference Title
Book Title
Edition
Volume
11
Issue
3
Thesis Type
Degree Program
School
Publisher link
Patent number
Funder(s)
Grant identifier(s)
Rights Statement
Rights Statement
© 2019 The Authors. Marine and Coastal Fisheries published by Wiley Periodicals, Inc. on behalf of American Fisheries Society. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Item Access Status
Note
Access the data
Related item(s)
Subject
Engineering
Science & Technology
Life Sciences & Biomedicine
Fisheries
Marine & Freshwater Biology
RANINA-RANINA
Persistent link to this record
Citation
Spencer, DM; Brown, IW; Doubell, MJ; McGarvey, R; Lee, SY; Lemckert, CJ, Bottom Currents Affect Spanner Crab Catch Rates in Southern Queensland, Australia, Marine and Coastal Fisheries, 2019, 11 (3), pp. 248-257
Collections