Publications des scientifiques de l'IRD

Cayré Patrice, laloë Francis. (1986). Review of the gonad index (GI) and an introduction to the concept of its "critical value" : application to the skipjack tuna Katsuwonus pelamis in the Atlantic ocean. Marine Biology, 90, p. 345-351.

Titre du document
Review of the gonad index (GI) and an introduction to the concept of its "critical value" : application to the skipjack tuna Katsuwonus pelamis in the Atlantic ocean
Année de publication
1986
Type de document
Article
Auteurs
Cayré Patrice, laloë Francis
Source
Marine Biology, 1986, 90, p. 345-351
With special reference to tunas and using recent results obtained on the skipjack tuna Katsuwonus pelamis, the author point out that Gonad Index (GI, defined as the ratio between the weight of the gonads and the size of the fish to the cube) is an inaccurate indicator of each of the different sexual maturity stages commonly used to describe the sexual maturation process of marine fishes. They also show that it would be of interest to determine a GI critical value in order to distinguish females in an advanced stage of maturation from the others. Using diameter measurements of skipjack tuna oocytes they adjust a non linear model between GI and the diameter of the most advanced group of oocytes. This permits the estimation of a GI critical value. This critical value is discussed. (Résumé d'auteur)
Plan de classement
Biométrie [020STAT05]
Descripteurs
THON ; MATURITE SEXUELLE ; REPRODUCTION ; MODELE MATHEMATIQUE ; VALEUR SEUIL
Description Géographique
ATLANTIQUE
Localisation
Fonds IRD [F B31169] ; Montpellier (Centre IRD)
Identifiant IRD
fdi:31169
Contact