File(s) under embargo

10

month(s)

11

day(s)

until file(s) become available

Octopus as predators of abalone on a sea ranch

journal contribution
posted on 10.08.2021, 00:02 by CN Greenwell, NR Loneragan, Ryan AdmiraalRyan Admiraal, JR Tweedley, M Wall
This study examined the occurrence of octopus across an abalone, Haliotis laevigata, Donovan, sea ranch in south-western Australia, to understand how octopus may be impacting abalone production. Commercial divers removed 654 octopus and 17,666 empty abalone shells during regular, 2 to 4-weekly surveys over 27 months. A negative binomial generalised linear model estimated a 78% increase in empty shells per artificial abalone habitat per day, when octopuses were present, after adjusting for location and season. Of the 408 shells examined for evidence of predation, 19% had a small, slightly ovoid hole consistent with those made by octopus. The mean (± 1 SE) length of shells with boreholes (70.3 ± 2.2 mm) was significantly longer than those without (59.8 ± 0.5 mm), and boreholes were concentrated over the adductor, respiratory organs and heart. This study provides important insights into the adaptable feeding regimes of octopus and their potential to impose strong top-down controls on sea ranching operations.

History

Preferred citation

Greenwell, C. N., Loneragan, N. R., Admiraal, R., Tweedley, J. R. & Wall, M. (2019). Octopus as predators of abalone on a sea ranch. Fisheries Management and Ecology, 26(2), 108-118. https://doi.org/10.1111/fme.12328

Journal title

Fisheries Management and Ecology

Volume

26

Issue

2

Publication date

01/04/2019

Pagination

108-118

Publisher

Wiley

Publication status

Published

Online publication date

09/01/2019

ISSN

0969-997X

eISSN

1365-2400

Language

en