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Title: Growth estimation in some species of bivalves, gastropods and crustaceans by the ELEFAN programs and some other graphical and non-parametric methods
Author: Mohd Nasir, M. T.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1994
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The performance of the computer programs Compleat ELEFAN, MIX, ELEFAN I, SLCA and PROJMAT was investigated using real data of six species: the bivalves Cerastoderma edule, Abra alba and Tellina tenuis; the gastropods Acteon tornatilis and Rissoa parva and the crustacean Carcinus maenas. The preciseness of estimates produced by these programs has been verified by comparing with results obtained from age-based analyses (using annuli) in C.edule and A.alba. The age-based analyses support the accuracy of both Compleat ELEFAN and MIX whose estimates were shown to be nearly identical to each other. Estimates by ELEFAN I (LFDA), which utilises a non-seasonalised version of the von Bertalanffy growth model, were generally less close to the age-based estimate and to these two programs. Relatively poorer estimates were also obtained when SLCA or PROJMAT was employed. In C.edule, using modal class progression analysis Compleat ELEFAN overestimate L by 3.9% and underestimate K by 4.5%. MIX overestimate both L and K by only 0.9% and 1.5%, respectively. ELEFAN I (LFDA) overestimate L by 7.1%, and K by 6.1% SLCA overestimate L by 10.4% and underestimate K by 24.2% while PROJMAT overestimate L by 10.4% but underestimate K by 39.4%. The general pattern of results obtained in C.edule was repeated in A.alba and the other species, although in the latter no verification can be carried out.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available