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Titolo:
OVARIAN DEVELOPMENT AND CYCLES IN CULTURED SIBERIAN STURGEON, ACIPENSER BAERI
Autore:
WILLIOT P; BRUN R;
Indirizzi:
CEMAGREF,RESSOURCES AQUAT CONTINENTALES,50 AVE VERDUN F-33612 CESTAS FRANCE
Titolo Testata:
Aquatic living resources
fascicolo: 2, volume: 11, anno: 1998,
pagine: 111 - 118
SICI:
0990-7440(1998)11:2<111:ODACIC>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSMONTANUS RICHARDSON; PADDLEFISHES;
Keywords:
ACIPENSER BAERI; BROODSTOCK MANAGEMENT; OVARIAN DEVELOPMENT; OVARIAN CYCLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
P. Williot e R. Brun, "OVARIAN DEVELOPMENT AND CYCLES IN CULTURED SIBERIAN STURGEON, ACIPENSER BAERI", Aquatic living resources, 11(2), 1998, pp. 111-118

Abstract

Sturgeon lack external sexual dimorphism and have longer-than-annual ovarian cycles. Using gonadal biopsy of marked fish, we identified sexand monitored ovarian development in one cohort of cultured Siberian sturgeon over the age interval 8.5-12.5 year Sex ratio in the population did not differ from 1:1 (268 females and 286 males). Each November,the females were separated into two groups: one with ovarian folliclediameter greater than or equal to 2.8 mm (Group 2, spawnable) and another with smaller follicles in previtellogenic or vitellogenic growth (Group 1). During the 5 year period of observations, 11.2 % of the initial 268 females were lost. The oocytes of Group 2 exhibited migratorygerminal vesicle but its position in animal hemisphere was not peripheral in November. The annual changes in proportions of Group 2 females, from 34.6 to 63.3 %, reflected ovarian cycles of different duration. Majority of 196 females, matured two or mole times during a period ofstudy. exhibited biennial ovarian cycle or recurring cycles of I and 2 years in the same individual. Annual and triennial cycles were also observed. Some abnormalities in oocyte pigmentation are described. (C)lfremer-Elsevier. Paris.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/21 alle ore 01:56:46