none none FRESHWATER CRAYFISH: Geographical variation in the giant freshwater crayfish, <i>Astacopsis gouldi</i>: deductions from a large opportunistic database
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Freshwater Crayfish 24(1): 15-21 (2019)

PEER REVIEWED    RESEARCH ARTICLE

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Geographical variation in the giant freshwater crayfish, Astacopsis gouldi: deductions from a large opportunistic database

Richardson AMM and Walsh T  e-mail link

Published Online: 2/22/2019

Abstract

An on-going opportunistic tagging program marked almost 600 giant freshwater crayfish, Astacopsis gouldi, between 22-222 mm carapace length from 123 localities on 62 rivers in Tasmania since 1998. Eighty animals were recaptured once, 50 more than once, and the longest period between initial and latest capture was 8 years. These data were analysed to examine differences in size and growth between the sexes, between the disjunct eastern and western ranges of the species, and between catchments on nutrient-poor and nutrient-rich rocks. Male animals were heavier per unit length than females, as were animals from the western part of the range compared to the naturally disjunct eastern range. Males grew slightly faster than females. Animals from a catchment underlain by nutrient-poor quartzite rocks grew more slowly than those in a neighbouring catchment on richer dolerite. Individual growth histories varied considerably and suggest that there may be fast-growing and slow-growing animals within the population.

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How to Cite

Richardson AMM and Walsh T. (2019). Geographical variation in the giant freshwater crayfish, Astacopsis gouldi: deductions from a large opportunistic database. Freshwater Crayfish 24(1):15-21. doi: 10.5869/fc.2019.v24-1.15

 

 

Author Information

Alastair MM Richardson,* , University of Tasmania, Private Bag 5, GPO, Hobart, Tasmania, Australia7001. E-mail: alastair.richardson@utas.edu.au

Todd S. Walsh, Kannunah P/L, Kannunah P/L, PO Box 4017, Goonellabah, NSW, Australia2480. E-mail: giantlobsters@hotmail.com

Corresponding Author indicated by an *.

 

Publication History

   Manuscript Submitted: 10/7/2018

   Manuscript Accepted: 1/31/2019

   Published Online: 2/22/2019

   Published in Print: 2/28/2019

 

 

Funding Information

No specific funding statement is available for this article.

 

 



 

 

 

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