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Conversion of southern rock lobster (Jasus edwardsii) carapace length to tail width for enforcement of size limits
journal contribution
posted on 2023-05-17, 19:35 authored by Fry, C, Bridget Green, Caleb GardnerCaleb GardnerThe morphometric relationship of carapace length (CL) to tail width (TW) of southern rock 10 lobster (Jasus edwardsii) was determined to assist enforcement of existing minimum size limits and also to enable the development of an upper size limit in Tasmania. Data were collected from southern rock lobsters in the wild and at processors and used to develop a system for measuring TW which reduces measurement error. Linear regression was used to define the relationship between CL and TW for males (TW=0.4107x+14.058, R2=.9236, n = 1003) and females 15 (TW=0.5756x+2.2884, R2=.9323, n=503). Logistic regressions provide the TWs associated with the probability (0.5, 50 and 95%) of a lobster having a carapace equal to or more than the theoretical size limits. Regional differences in the morphometric relationship were evident but would not prevent the use of size limit based on TW if a conservative probability value were used.
History
Publication title
New Zealand Journal of Marine and Freshwater ResearchVolume
48Pagination
139-146ISSN
0028-8330Department/School
Institute for Marine and Antarctic StudiesPublisher
Sir PublishingPlace of publication
Po Box 399, Wellington, New ZealandRights statement
Copyright 2014 Taylor and FrancisRepository Status
- Restricted