Spatial variation in size at onset of maturity of female southern rock lobster <i>Jasus edwardsii</i> around Tasmania, Australia

Caleb Gardner; Stewart Frusher; Neville Barrett; Malcolm Haddon; Colin Buxton

doi:10.3989/scimar.2006.70n3423

Autores/as

Caleb Gardner Tasmanian Aquaculture and Fisheries Institute, University of Tasmania
Stewart Frusher Tasmanian Aquaculture and Fisheries Institute, University of Tasmania
Neville Barrett Tasmanian Aquaculture and Fisheries Institute, University of Tasmania
Malcolm Haddon Tasmanian Aquaculture and Fisheries Institute, University of Tasmania
Colin Buxton Tasmanian Aquaculture and Fisheries Institute, University of Tasmania

DOI:

https://doi.org/10.3989/scimar.2006.70n3423

Palabras clave:

Jasus edwardsii, madurez, langosta, reproducción, gestión espacial

Resumen

En 50 sitios alrededor de Tasmania (Australia) se estimó la talla de inicio de madurez sexual (SOM) en hembras de Jasus edwardsii (Hutton, 1875) basándose en la presencia de sedas ovígeras. La mayor SOM fue observada en la región del Noroeste y la talla menor en el Suroeste. La SOM varió entre 59 mm y 112 mm en longitud del caparazón. La disminución en la SOM desde el norte hacia sur fue inversa a la descrita previamente para la misma especie en similares latitudes en Nueva Zelanda. Esto sugeriría que la SOM en hembras de J. edwardsii es regulada por otros factores además de la temperatura. El efecto de la densidad de langostas en la SOM de hembras de J. edwardsii fue comparado usando SOM estimadas a partir de sitios con alta (reservas marinas) y baja densidad (sitios de pesca) de langostas. El incremento en la densidad no disminuyó la SOM como fue previamente predicho. Para mejorar y facilitar los modelos sobre los stocks de langostas, se describe un modelo para predecir la SOM que incorpora la latitud y la longitud como componentes espaciales. Dado que la SOM depende substancialmente y de manera predecible de las variaciones espaciales, el manejo de la pesquería de J. edwardsii podría ser mejorado con la incorporación de componentes espaciales a los planes de manejo, como por ejemplo establecer regionalmente un tamaño límite legal.

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Citas

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