Scientia Marina, Vol 62, No S1 (1998)

Growth studies on Norway lobster, Nephrops norvegicus (L.), in different areas of the Mediterranean Sea and the adjacent Atlantic


https://doi.org/10.3989/scimar.1998.62s143

Chryssi Mytilineou
NCMR, Institute of Marine Biological Resources, Greece

Margarida Castro
UCTRA, Universidade do Algarve, Portugal

Paula Gancho
UCTRA, Universidade do Algarve, Portugal

Anna Fourtouni
NCMR, Institute of Marine Biological Resources, Greece

Abstract


A comparative study of the growth of Nephrops norvegicus among different areas in the Mediterranean Sea and the adjacent Atlantic was conducted. MIX and Bhattacharya´s length-based methods were used for age determination. Both methods were used for all the studied areas. For the estimation of the growth parameters two non-linear methods, based on the results of the length frequency analysis, were used; the Gauss-Newton method, implemented by the SAS program, was applied using the results of the MIX and the FISHPARM program using the results of the Bhattacharya´s method. The identification of the age groups and their mean lengths-at-age as well as the estimation of the growth parameters proved to be difficult. A question regarding the adequacy of the von Bertalanffy model was also posed. Remarkable differences were obvious between sexes in the number of identified age groups and their mean lengths-at-age as well as in their growth parameters in all areas. The comparison of the results obtained for the studied areas showed differences, which could not be considered very important except in the case of the Nephrops population of the Alboran Sea, which was characterised by a high growth rate. All other areas seemed to be close; among them the populations from Euboikos Gulf and Catalan Sea being the most different.

Keywords


Nephrops norvegicus; crustacean; growth; age; length frequency analysis; Mediterranean; Atlantic

Full Text:


PDF


Copyright (c) 1998 Consejo Superior de Investigaciones Científicas (CSIC)

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.


Contact us scimar@icm.csic.es

Technical support soporte.tecnico.revistas@csic.es