Scientia Marina, Vol 65, No 2 (2001)

Fecundity and egg volume in Norway lobster (Nephrops norvegicus) from different depths in the northern Tyrrhenian Sea


https://doi.org/10.3989/scimar.2001.65n2111

Mario Mori
Dipartimento per lo Studio del Territorio e delle sue Risorse, Italy

Milena Modena
Dipartimento di Biologia Sperimentale, Ambientale ed Applicata, Italy

Franco Biagi
Dipartimento di Scienze dell’Uomo e dell’Ambiente, Italy

Abstract


The relationships between fecundity and egg volume of Norway lobster (Nephrops norvegicus) inhabiting three different depth ranges (200-300, 350-450, and 500-550 m) in the North Tyrrhenian Sea (western Mediterranean) were compared. Fecundity was not dependent on depth and egg volume did not vary with female size. The egg volume of females collected in the shallowest areas (200-450 m) was instead significantly larger than that collected in deeper waters (500-550 m). Possible explanations for this fact are examined.

Keywords


fecundity; egg volume; depth; Nephrops norvegicus; western Mediterranean

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