Maturity classification and group maturity of the red sea bream Pagrus major

Matsuyama, Michiya; Matsuura, Shuhei; Ouchi, Yoshimitsu; Hidaka, Toshitaka

doi:10.1007/bf00427015

Cited by 18 publications

(10 citation statements)

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“…Despite this, the size composition at maturity is quite similar in both sexes, the median length being 109 and 113 cm SL for females and males, respectively. In females the larger size classes have a higher percentage of fish in the higher maturity stages than the smaller size classes, like in other teleost (HUNTER and LEONG 1981;PARRISH et al 1986;MATSUYAMA et al 1987).…”

Section: Discussionmentioning

confidence: 94%

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Aspects of reproductive biology of the Mediterranean amberjack (Seriola dumerilii Risso) during the spawning period

et al. 1995

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Wild Seriola dumerilii were collected in the South Mediterranean Sea during the 1990, 1991 and 1992 spawning seasons. Macroscopic and cytological characteristics of ovary and testis were analysed. Depending on the presence and the number of oocytes at different stages, a five point maturity scale was proposed for ovarian maturity. Nine maturity stages of the oocytes are described. Oocyte sizefrequency distribution has shown a group synchronous ovarian develo ment type. The testes have a ty ical lobular-type structure. Depending on lobules and sperm duct deveyopment and on the abundance .?germ cells, testis maturity was classified in four stages. Maturity rate according to age and size was also determined. 100 % of I-year-old fish show immature gonads. The proportion of females with mature ovaries was 0, 12.5,84.6 and 100 % at the age of 2,3,4 and 5 years respectively. The proportion of males with mature testes was 14.3, 40, 80 and 100 at the same age. The median standard length at which 50 % of the fish attained maturity is 109 and 113 cm SL in males and females respectively.

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Section: Discussionmentioning

confidence: 94%

“…Fish were aged by the count of the rings on the scales according to ANDALORO et al (1992). Gonadosomatic index was calculated as reported by MATSUYAMA et al (1987). The sex of S. dumerilii is not detectable by means of visual examination.…”

Section: Methodsmentioning

confidence: 99%

Aspects of reproductive biology of the Mediterranean amberjack (Seriola dumerilii Risso) during the spawning period

et al. 1995

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“…The available reproductive biological information on the sevenband grouper is also not sufficient; in particular, information on gonadal development such as the ovarian maturation process, reproductive cycle and hormone action on gonad is needed. Presently, the efficiency of seed production for red sea bream 3 and Japanese flounder 4 is greatly enhanced due to advances in the understanding of their reproductive physiology. It is therefore necessary to accumulate reproductive information to establish seed production in sevenband grouper.…”

Section: Introductionmentioning

confidence: 99%

Ovarian development and final oocyte maturation in cultured sevenband grouper Epinephelus septemfasciatus

et al. 2004

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The histological changes in the ovary of sevenband grouper Epinephelus septemfasciatus were examined during vitellogenesis and final oocyte maturation. Ovaries contained oocytes at the perinucleolus stage at the start of the experiment in January. Oocytes at the primary yolk stage appeared when the gonadosomatic index (GSI) was slightly on the rise in March. After that, vitellogenesis progressed and ovaries contained oocytes at the tertiary yolk stage in May. The GSI increased drastically at the same time. These results suggest that vitellogenesis in sevenband grouper starts or is already in progress in March and is completed by May, In order to clarify the process of final oocyte maturation, luteinizing hormone-releasing hormone (LHRH) analog (des Gly 10 , [D-Ala 6 ] LHRH ethylamide) was implanted in fish with oocytes at the tertiary yolk stage. The oocytes developed to the migratory nucleus stage in 18 h and reached the maturation stage in 42 h after implantation. This indicates that final oocyte maturation is completed within 42 h after stimulation of gonadotropinreleasing hormone.KEY WORDS: estradiol-17β β β β , final oocyte maturation, gonadosomatic index, LHRHa, ovarian development, sevenband grouper.

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“…Furthermore, the simultaneous presence of oocytes at different developmental stages indicated that oocyte development was asynchronous. Studies in Japan (Matsuyama et al 1987(Matsuyama et al , 1988 and New Zealand (Scott & Pankhurst 1992) have also concluded that the snapper is a multiple batch spawner with asynchronous oocyte development and indeterminate fecundity. No prior studies in Australia have documented the reproductive mode of snapper.…”

Section: Discussionmentioning

confidence: 99%

The spawning dynamics of snapper (Chrysophrys auratus) in northern Spencer Gulf, South Australia

Saunders

Fowler

Gillanders

2012

New Zealand Journal of Marine and Freshwater Research

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This study investigated the inter-and intra-annual variation in the spawning dynamics of snapper (Chrysophrys auratus). Reproductive samples from northern Spencer Gulf, South Australia were collected over three seasons (2005/06, 2006/07 and 2007/08) and were analysed macro and microscopically. Spawning activity was determined by calculating estimates of spawning fraction and batch fecundities. The onset of spawning occurred in November but varied between years and corresponded with times when water temperature was between 18 8C and 20 8C. The length of the spawning season also differed between years. In each year the peak spawning activity occurred during December when fish spawned almost daily. Spawning frequency and relative batch size did not differ between the first two spawning seasons but, in the third season, batch size was considerably greater and spawning fractionally lower. These results are contrasted with a known recruitment of 0' over the three years of the study.

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Maturity classification and group maturity of the red sea bream Pagrus major

Cited by 18 publications

References 1 publication

Aspects of reproductive biology of the Mediterranean amberjack (Seriola dumerilii Risso) during the spawning period

Aspects of reproductive biology of the Mediterranean amberjack (Seriola dumerilii Risso) during the spawning period

Ovarian development and final oocyte maturation in cultured sevenband grouper Epinephelus septemfasciatus

The spawning dynamics of snapper (Chrysophrys auratus) in northern Spencer Gulf, South Australia

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