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Influence of density-dependent food consumption, foraging and stacking behaviour on the growth rate of the Northern abalone, Haliotis kamtschatkana

Influence of density-dependent food consumption, foraging and stacking behaviour on the growth rate of the Northern abalone, Haliotis kamtschatkana
Influence of density-dependent food consumption, foraging and stacking behaviour on the growth rate of the Northern abalone, Haliotis kamtschatkana
Growth of abalone in the wild and hatchery is density-dependent in response to intraspecific competition for food and/or space. To determine if a candidate aquaculture species, Haliotis kamtschatkana, exhibits density-dependent growth we raised animals at three density levels and two food treatments: unlimited (ad libitum) and rationed (individual portions were the same among density treatments). We also tested for differences in food consumption, foraging patterns and stacking behaviour among the density levels. We observed density-dependent growth in the rationed treatments, indicating that relatively high growth rates at lower densities are driven, in part, by factors other than differences in food consumption. However, overall the quantity of food consumed related directly to growth; treatments fed ad libitum had higher growth rates. Furthermore, even when food was provided in excess, foraging was restricted to ~ 2 h after sunset in all treatments and the amount consumed per abalone was significantly lower at high densities. This is probably because high density animals could not access the food provided: fewer were observed foraging and they had to move from prominent stacks. Our results indicate that both temporal and spatial access to food are critical and that managers can observe foraging and stacking by abalone in tanks to determine if a specific design will limit food consumption, and ultimately growth.
Density-dependent growth, Northern or Pinto abalone (Haliotis kamtschatkana), Food accessibility, Food consumption, Foraging, Stacking, Aquaculture
0044-8486
24-29
Lloyd, Michelle J.
c946fc2c-4e81-4410-b979-6173de0e2af3
Bates, Amanda E.
a96e267d-6d22-4232-b7ed-ce4e448a2a34
Lloyd, Michelle J.
c946fc2c-4e81-4410-b979-6173de0e2af3
Bates, Amanda E.
a96e267d-6d22-4232-b7ed-ce4e448a2a34

Lloyd, Michelle J. and Bates, Amanda E. (2008) Influence of density-dependent food consumption, foraging and stacking behaviour on the growth rate of the Northern abalone, Haliotis kamtschatkana. Aquaculture, 277 (1-2), 24-29. (doi:10.1016/j.aquaculture.2008.01.039).

Record type: Article

Abstract

Growth of abalone in the wild and hatchery is density-dependent in response to intraspecific competition for food and/or space. To determine if a candidate aquaculture species, Haliotis kamtschatkana, exhibits density-dependent growth we raised animals at three density levels and two food treatments: unlimited (ad libitum) and rationed (individual portions were the same among density treatments). We also tested for differences in food consumption, foraging patterns and stacking behaviour among the density levels. We observed density-dependent growth in the rationed treatments, indicating that relatively high growth rates at lower densities are driven, in part, by factors other than differences in food consumption. However, overall the quantity of food consumed related directly to growth; treatments fed ad libitum had higher growth rates. Furthermore, even when food was provided in excess, foraging was restricted to ~ 2 h after sunset in all treatments and the amount consumed per abalone was significantly lower at high densities. This is probably because high density animals could not access the food provided: fewer were observed foraging and they had to move from prominent stacks. Our results indicate that both temporal and spatial access to food are critical and that managers can observe foraging and stacking by abalone in tanks to determine if a specific design will limit food consumption, and ultimately growth.

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More information

Published date: 12 May 2008
Keywords: Density-dependent growth, Northern or Pinto abalone (Haliotis kamtschatkana), Food accessibility, Food consumption, Foraging, Stacking, Aquaculture
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 361241
URI: http://eprints.soton.ac.uk/id/eprint/361241
ISSN: 0044-8486
PURE UUID: dbb2c96a-0057-4006-8214-9b66e5127ddb

Catalogue record

Date deposited: 15 Jan 2014 15:17
Last modified: 16 Jul 2019 21:14

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