Tanner’s Sexual Maturity Stages

Size at first maturity of Terapon jarbua was studied based on 114 male (14 to 28 cm in TL) and 140 female (14 to 32 cm in TL). The Logistic curves describing the relationship between the sexes and the proportion of 50% maturity (Lm50) were estimated at 20.8 cm in male and 21.8 cm in female of Terapon jarbua. The male reached 50% first sexual maturity at smaller lengths than female in this species. The gonads were classified into five maturity stages based on the size, colour and texture. Month wise predominance of different stage of maturity deferred during different months.

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Sexual Maturity Stages

10.1542/9781581105698-part02-sexual_maturity_stages ◽

2010 ◽

pp. 79-85

Author(s):

Marcia Herman-Giddens ◽

Paul B. Kaplowitz

Keyword(s):

Sexual Maturity ◽

Maturity Stages

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Reproduction of the Brazilian snapper, Lutjanus alexandrei Moura & Lindeman, 2007 (Perciformes: Lutjanidae), off the northern coast of Pernambuco, Brazil

Neotropical Ichthyology ◽

10.1590/s1679-62252012005000022 ◽

2012 ◽

Vol 10 (3) ◽

pp. 587-592 ◽

Cited By ~ 9

Author(s):

Cezar A. F. Fernandes ◽

Paulo G. V. de Oliveira ◽

Paulo E. P. Travassos ◽

Fábio H. V. Hazin

Keyword(s):

Sex Ratio ◽

Sexual Maturity ◽

Gonadosomatic Index ◽

Northern Coast ◽

Batch Fecundity ◽

Spawning Behavior ◽

Spermatogenic Cells ◽

Maturity Stages ◽

Microscopic Evaluation ◽

Batch Spawning

Reproductive aspects of the Brazilian snapper Lutjanus alexandrei, were characterized, including a description of the development of oocytes and spermatogenic cells, size at first sexual maturity, and fecundity. A total of 540 fish were analyzed with 250 having their gonads sectioned to allow microscopic evaluation. Six maturity stages were identified for females and males: immature, maturing, mature, spawning, spawned, and resting. Fish standard length (SL) varied from 13.0 to 28.3 cm and sex ratio was 1.6 males: 1.0 females. Monthly distributions of mean Gonadosomatic Index (GSI) and maturity stages suggest that spawning occurs mainly in a protracted period, during the warmer months, from November to March. The size of first sexual maturity was estimated at 17.1 cm SL for females and 16.8 cm SL for males. Oocyte development suggests that L. alexandrei exhibits a multiple batch spawning behavior and batch fecundity varied from 34,000 to 324,000 oocytes.

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Reproductive cycle of the Patagonian scallop Zygochlamys patagonica in the south-western Atlantic

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315408001033 ◽

2008 ◽

Vol 88 (3) ◽

pp. 603-611 ◽

Cited By ~ 10

Author(s):

Silvana Campodónico ◽

Gustavo Macchi ◽

Betina Lomovasky ◽

Mario Lasta

Keyword(s):

Reproductive Cycle ◽

Energy Demand ◽

Sexual Maturity ◽

Shell Height ◽

Condition Index ◽

Early Summer ◽

The South ◽

Early Maturity ◽

Western Atlantic ◽

Maturity Stages

The reproductive cycle of Zygochlamys patagonica was studied from October 1999 to February 2001 in a bed located in the south-western Atlantic (Reclutas bed 39°24′ S–55°56′W). Scallops were collected monthly and the sexual maturity stages were determined histologically (N = 508). Sex-ratio was 1:1 (t-test P > 0.05). The size of first sexual maturity was estimated from males of an average of 36.63 mm and females of 36.31 mm of shell height. The relative gonadal condition index (RGCI) showed an annual cycle, with higher values during winter–spring and lower values during summer–autumn; an inverse relationship for the relative muscle condition index (RMCI) was observed with maximum values in early summer. Thus, a reallocation of energy from soma to gonad appears to be inevitable to meet energy demand of gonad development. Seven histological stages of sexual maturity were established for both sexes: (1) immature; (2) early maturity; (3) advanced maturity,;(4) ripe; (5) spawning; (6) spent; and (7) recovery. Individuals in early and advanced maturity were found throughout the year; however, they were found more frequently between June and September. Spawning began in October (early spring) and extended through March (late summer–early autumn) coexisting with early and advanced maturity stages supported by the annual variation of the RGCI and the food availability into the system.

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Sexual maturity stages of canned chum salmon segregated using static headspace volatile patterns

Food Research International ◽

10.1016/0963-9969(94)90241-0 ◽

1994 ◽

Vol 27 (5) ◽

pp. 469-476 ◽

Cited By ~ 2

Author(s):

Benoit Girard ◽

Shuryo Nakai

Keyword(s):

Sexual Maturity ◽

Chum Salmon ◽

Static Headspace ◽

Headspace Volatile ◽

Maturity Stages

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THE »EARLY-ANDROGEN« SYNDROME; ITS DEVELOPMENT AND THE RESPONSE TO HEMI-SPAYING

Acta Endocrinologica ◽

10.1530/acta.0.0450001 ◽

1964 ◽

Vol 45 (1) ◽

pp. 1-12 ◽

Cited By ~ 46

Author(s):

H. E. Swanson ◽

J. J. van der Werff ten Bosch

Keyword(s):

Sexual Maturity ◽

Compensatory Growth ◽

Testosterone Propionate ◽

Single Injection ◽

Weight Increase ◽

Corpora Lutea ◽

Transition Stage ◽

Adult Females

ABSTRACT The »early-androgen« syndrome in the rat – i. e. anovulatory ovaries in adult females after a single injection of testosterone propionate (TP) within a week of birth – may not become apparent until some time after the attainment of sexual maturity. Large doses (50 or 100 μg) of TP were effective earlier than lower doses (5 or 10 μg). Rats which received 5 μg TP were ovulating at 10 weeks of age, mated but were infertile at 13 weeks of age, and were anovulatory at 21 weeks. In rats between 10 and 13 weeks old there was a marked fall in the number of corpora lutea in the ovaries of animals which had been given 5 μg TP. Hemi-spaying was followed by compensatory growth of the remaining ovary which consisted of corpora lutea in ovulating, and of follicles in anovulatory rats; little or no compensatory weight increase occurred in animals which seemed to be in the transition stage from the ovulatory to the anovulatory condition.

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