FN Archimer Export Format PT J TI Utilisation de critères fonctionnels (présence de spermatophore, maturation des ovaires) pour la détermination de la taille et de l'âge à maturité sexuelle des Nephrops norvegicus femelles de la région sud-Bretagne OT Use of functional criteria (presence of spermatophores, maturity of ovaries) for the determination of length and age of sexual maturity of Nephrops norvegicus females from South Brittany BT AF MORIZUR, Yvon AS 1:; FF 1:PDG-DOP-DCB-STH-LBH; SI BREST SE PDG-DOP-DCB-STH-LBH TC 0 UR https://archimer.ifremer.fr/doc/1983/publication-2349.pdf LA French DT Article DE ;Brittany;France;ANE;Crustacea;Nephrops norvegicus;females;growth;sexual maturity AB The average length at which female Nephrops norvegicus attain their first maturity was determined during 1977 and 1978 by following the presence of spermatophores and development of the ovaries. During 1978, females were sexually mature at the age of 2 but in 1977 they did not mature before the age of 3. The cumulative maturity curves are sigmoid, due to an overlapping of Gaussian curves. A logistic equation was developed to calculate the percentage of mature females at each length. There is no evidence that the present fishing levels reduce the chances of a female with developing ovaries to be fertilized, since 90 to 100% of such females bear spermatophores. PY 1983 SO Journal du Conseil - Conseil International pour l'Exploration de la Mer PU CIEM-Conseil International pour l'Exploitation de la Mer VL 41 BP 28 EP 36 ID 2349 ER EF