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A multilevel approach to examining cephalopod growth using Octopus pallidus as a model
Citation
Semmens, JM and Doubleday, ZA and Hoyle, K and Pecl, GT, A multilevel approach to examining cephalopod growth using Octopus pallidus as a model, Journal of Experimental Biology, 214, (16) pp. 2799-2807. ISSN 0022-0949 (2011) [Refereed Article]
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Copyright Statement
Copyright 2011 The Company of Biologists
Abstract
Many aspects of octopus growth dynamics are poorly understood, particularly in relation to sub-adult or adult growth, muscle
fibre dynamics and repro-somatic investment. The growth of 5ƒnmonth old Octopus pallidus cultured in the laboratory was
investigated under three temperature regimes over a 12ƒnweek period: seasonally increasing temperatures (14¡V18¢XC); seasonally
decreasing temperatures (18¡V14¢XC); and a constant temperature mid-way between seasonal peaks (16¢XC). Differences in somatic
growth at the whole-animal level, muscle tissue structure and rate of gonad development were investigated. Continuous
exponential growth was observed, both at a group and at an individual level, and there was no detectable effect of temperature
on whole-animal growth rate. Juvenile growth rate (from 1 to 156ƒndays) was also monitored prior to the controlled experiment;
exponential growth was observed, but at a significantly faster rate than in the older experimental animals, suggesting that
O. pallidus exhibit a double-exponential two-phase growth pattern. There was considerable variability in size-at-age even between
individuals growing under identical thermal regimes. Animals exposed to seasonally decreasing temperatures exhibited a higher
rate of gonad development compared with animals exposed to increasing temperatures; however, this did not coincide with a
detectable decline in somatic growth rate or mantle condition. The ongoing production of new mitochondria-poor and
mitochondria-rich muscle fibres (hyperplasia) was observed, indicated by a decreased or stable mean muscle fibre diameter
concurrent with an increase in whole-body size. Animals from both seasonal temperature regimes demonstrated higher rates of
new mitochondria-rich fibre generation relative to those from the constant temperature regime, but this difference was not
reflected in a difference in growth rate at the whole-body level. This is the first study to record ongoing hyperplasia in the muscle
tissue of an octopus species, and provides further insight into the complex growth dynamics of octopus.
Item Details
Item Type: | Refereed Article |
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Keywords: | growth, muscle fibre dynamics, repro-somatic investment, seasonal temperature regime, cephalopod, octopus |
Research Division: | Agricultural, Veterinary and Food Sciences |
Research Group: | Fisheries sciences |
Research Field: | Fisheries management |
Objective Division: | Animal Production and Animal Primary Products |
Objective Group: | Fisheries - wild caught |
Objective Field: | Wild caught edible molluscs |
UTAS Author: | Semmens, JM (Professor Jayson Semmens) |
UTAS Author: | Doubleday, ZA (Dr Zoe Doubleday) |
UTAS Author: | Hoyle, K (Ms Kate Hoyle) |
UTAS Author: | Pecl, GT (Professor Gretta Pecl) |
ID Code: | 72033 |
Year Published: | 2011 |
Web of Science® Times Cited: | 15 |
Deposited By: | Sustainable Marine Research Collaboration |
Deposited On: | 2011-08-18 |
Last Modified: | 2017-11-01 |
Downloads: | 1 View Download Statistics |
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