scholarly journals Size at first maturity and maturity stages of Terapon jarbua (Forsskal, 1775) from Pondicherry Coast, India

2016 ◽  
Vol 4 (2) ◽  
pp. 385 ◽  
Author(s):  
R Nandikeswari
Keyword(s):  
Sexual Maturity ◽  
Maturity Stages ◽  
First Maturity ◽  
The Relationship ◽  
Size At First Maturity ◽  
Logistic Curves

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.

scholarly journals Reproductive Biology of Coral Catshark Atelomycterus marmoratus (Anonymous [Bennett], 1830) in Seribu Islands, Indonesia

2019 ◽  
Vol 20 (8) ◽  
Author(s):  
Selvia Oktaviyani ◽  
WANWAN KURNIAWAN ◽  
FAHMI
Keyword(s):  
Reproductive Biology ◽  
Gonadosomatic Index ◽  
Maturity Stage ◽  
Total Length ◽  
Mean Size ◽  
The Mean ◽  
First Maturity ◽  
The Relationship ◽  
Monthly Variations ◽  
Size At First Maturity

This study provides information on the reproductive biology of the coral catshark caught in the waters around Seribu Islands, Indonesia. A total of 257 coral catsharks were collected from February 2017 to January 2018. The total length of coral catshark ranged from 170 to 585 mm for females and 255-575 mm for males, respectively. The total weight of females ranged from 85 to 640 g and males from 100 to 620 g The sex ratio between females and males was 0.45 and it was not significantly different from the expected 1:1 ratio. The growth pattern of coral catsharks in Seribu Island was negatively allometric and the population was dominated by mature sharks. The mean size at first maturity was estimated to be 557 mm for females and 514 mm for males, based on to the relationship between the proportion between maturity stage and total length. The ovulation season was estimated occur from October to March, whereas September to April was mating season based on monthly variations of gonadosomatic index (GSI) values and the occurrence of egg cases in uterus.

scholarly journals Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

2016 ◽  
Vol 14 (4) ◽  
Author(s):  
Tiago Magalhães da Silva Freitas ◽  
◽  
Vitor Hudson da Consolação Almeida ◽  
Luciano Fogaça de Assis Montag ◽  
Nelson Ferreira Fontoura ◽  
...  
Keyword(s):  
Growth Pattern ◽  
Sexual Maturity ◽  
Gonadosomatic Index ◽  
Gonadal Development ◽  
Visual Identification ◽  
Males And Females ◽  
Two Phases ◽  
First Maturity ◽  
Size At First Maturity

ABSTRACT Relationship between length and weight (LWR) is used to describe aspects concerning the life cycle of fish, but does not considers possible changes during the lifetime mainly due to the sexual maturation. Thus, this study aims to identify the size at first maturity of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) and infer if the reproductive engagement could change growth pattern, concerning the LWR. Estimates of the size at first maturity (L 50 ) were made by visual identification of gonadal development and through the gonadosomatic index (G SI ). L 50 was estimated as 12.5 cm for males and 13.0 cm for females when applied visual identification of gonads development. L 50 estimates increased to 13.05 cm for males and 13.7 cm for females when estimated from G SI values. LWR was adjusted by using a regular power function and through the polyphasic growth model, with proportionality and allometric coefficients changing in a two phases. The results indicate differences in the growth pattern concerning males and females, as well as polyphasic growth. The change in the growth pattern of the polyphasic LWR was estimated at 11.42 cm for males and 12.53 cm for females, suggesting that changes in the growth pattern can sign-out the attainment maturity in this catfish.

Size and age at sexual maturity in Adelomelon brasiliana (Neogastropoda: Volutidae) off Argentina

2008 ◽  
Vol 88 (1) ◽  
pp. 169-173 ◽  
Author(s):  
Maximiliano Cledón ◽  
Wolf Arntz ◽  
Pablo E. Penchaszadeh
Keyword(s):  
Sexual Maturation ◽  
Shell Length ◽  
Sexual Maturity ◽  
Tissue Samples ◽  
Gonad Tissue ◽  
Secondary Sexual Characters ◽  
First Maturity ◽  
Size At First Maturity ◽  
Secondary Sexual

Size at first maturity of Adelomelon brasiliana near Mar del Plata, Argentina, was established analysing gonad tissue samples and the secondary sexual characters. Age was determined through growth marks. Gonad matures after development of secondary sexual characters.Minimum shell length at sexual maturity is 107 mm in females and 102 mm in males. The shell length at which 50% of the animals are mature is 115.1 mm in females and 107.25 mm in males (approximatley 7 years of age). In males, penis matures before testis. All animals are mature beyond 125 mm in females and 115 mm in males, respectively (approximatley 8 years of age). The comparative late sexual maturation in this species makes the population quite sensitive to over-fishing.

scholarly journals Maturation Biology and Spawning Ethos of A Hillstream Loach Lepidocephalus Guntea (Ham-Buch) From River Mandal, Pauri Garhwal, Uttarakhand

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Anoop Kumar Dobriyal
Keyword(s):  
Single Mode ◽  
Spawning Season ◽  
Continuous Growth ◽  
Spawning Frequency ◽  
Maturity Stages ◽  
Spawning Behaviour ◽  
First Maturity ◽  
Somatic Index ◽  
Size At First Maturity

The paper deals with studies on maturation biology and spawning behaviour of an important hill stream loach Lepidocephalus guntea (Ham-Buch) from river Mandal in District Pauri Garhwal Uttarakhand. It was observed that there was a continuous growth of ova throughout the year. Seven maturity stages in the fish were observed with single mode each month. Gonado-somatic index (GSI) and Dobriyal Index (DI) were calculated to find out the month of peak maturity, spawning frequency and spawning season. It was confirmed by tabulation of fishes in different maturity stages each month and also by physical observations in the field. It was concluded that June was the month of peak maturity and spawning takes place during July- August. Rare spawning was seen even in First week of September. Size at first maturity was 60-61 mm.

scholarly journals Size, sex and maturity of the squid Lolliguncula diomedeae (Cephalopoda: Loliginidae) in the Gulf of Tehuantepec, México.

2015 ◽  
Vol 7 (1) ◽  
pp. 79-87
Author(s):  
María del Carmen Alejo-Plata ◽  
José Luis Gómez-Márquez ◽  
Jorge Eduardo Herrera-Galindo
Keyword(s):  
Sexual Maturity ◽  
Gonadosomatic Index ◽  
Reproductive Activity ◽  
Allometric Growth ◽  
Relationship Type ◽  
Length Relationship ◽  
Gulf Of Tehuantepec ◽  
Males And Females ◽  
First Maturity ◽  
Size At First Maturity

There is practically no information on the biology of Lolliguncula (Loliolopsis) diomedeae. We analyzed specimens caught in four shrimp fishing trips in the Gulf of Tehuantepec in 1999-2001, 2004 and 2006.Sexual maturity and gonadosomatic index (GSI) were used as indicators of reproductive activity. A total of 1 200 individuals were captured, 89% female. Females ranged from 35 to 97mm in mantle length (LDM),with a mode at 80mm and weights 2 to 30,9g; males 20,7 to 65mm LDM with a mode at 35-40mm and weights from 0,4 to 12g. Differences in the LDM and the PT between males and females were significant (KS, p<0,05). The sex ratio was 8:1 H:M (p <0,05). The weight-length relationship type is potential for both sexes, with a negative allometric growth.83% of mature females had high IGS values, in contrast to less than 20% of mature males. The size at first maturity (L50) indicates that males (42,7mm LDM) mature when shorter than females (74,5mm LDM). Maturity, IGS and oceanographic features of the Gulf of Tehuantepec indicate that L. diomedeae spawn there.

scholarly journals Population biology of shrimp Artemesia longinaris (Crustacea: Decapoda: Penaeidae) from the southern coast of Brazil

2010 ◽  
Vol 90 (4) ◽  
pp. 663-669 ◽  
Author(s):  
Rogério Caetano da Costa ◽  
Joaquim Olinto Branco ◽  
Irecê Farina Machado ◽  
Bruno Ribeiro Campos ◽  
Marcelo Gentil Avila
Keyword(s):  
Population Biology ◽  
Sexual Maturity ◽  
Migration Pattern ◽  
Lower Latitude ◽  
Breeding Period ◽  
Southern Brazil ◽  
Mean Size ◽  
Continuous Reproduction ◽  
First Maturity ◽  
Size At First Maturity

Size at morphological sexual maturity, sex-ratio, and the seasonal variation in abundance of the shrimp Artemesia longinaris Bate, 1888 were assessed off Pinheira Beach, Palhoça, Santa Catarina southern Brazil. Shrimp were collected monthly from November 2003 through to October 2004, in two areas that are customarily used by local traditional fishermen (27°52′–27°51′S and 48°33′–48°29′W). Of the total of 1099 specimens measured, 23.93% were males and 76.07% females. Mean size at first maturity (LM50) was estimated as 56.38 mm total length (TL) for males, and 70.34 mm TL for females. Females were significantly larger than males. Abundance of juveniles varied seasonally. A high predominance of juveniles in the areas sampled occurred in winter for both sexes, and in spring for females. In the summer and autumn, we observed a decrease in juveniles in both areas, mainly, area II. We suggest that the differential migration pattern of sexes during the reproductive cycle was the principal reason for the larger catch of females. The classical paradigm of continuous reproduction at lower latitude, with increased seasonality of the breeding period at higher latitudes, seems to apply to this species.

Size at first maturity of Brachidontes rodriguezii (d'Orbigny, 1846) from the South-western Atlantic Ocean

2016 ◽  
Vol 98 (3) ◽  
pp. 457-462 ◽  
Author(s):  
María Eugenia Torroglosa ◽  
Juliana Giménez
Keyword(s):  
Shell Length ◽  
Logistic Model ◽  
Sexual Maturity ◽  
Gonad Development ◽  
Female Gonad ◽  
Visceral Mass ◽  
Western Atlantic ◽  
Length Increase ◽  
First Maturity ◽  
Size At First Maturity

The size at first maturity of the bivalve Brachidontes rodriguezii was estimated in a population located in the northernmost limit of its distribution along Argentinean coast. Specimens were collected in two consecutive reproductive seasons from December 2011 to February 2012 and from December 2012 to February 2013. Individuals were evaluated using biometric and histological analyses of the gonads. This study intended to provide important information about the development of gonadal tissue according to shell length increase. Our results showed immature specimens lack gonads or exhibited groups of cells undergoing mitosis adjacent to the epithelium of the mantle and the tubules of the digestive gland. Male and female gonad development extended to mantle lobes and visceral mass as long as maturation occurred to reach sexual maturity. Using a logistic model our results showed that the size at which 50% of females were mature at a gonadal level was 7.05 mm in shell length; in males, 50% of the population were mature at 8.13 mm in shell length. The minimum shell length at which maturity was observed was 6.99 mm in shell length in females and 6.00 mm in shell length for males.

scholarly journals Can weight/length relationship predict size at first maturity? A case study with two species of Characidae

2010 ◽  
Vol 8 (4) ◽  
pp. 835-840 ◽  
Author(s):  
Nelson F. Fontoura ◽  
Anamélia S. Jesus ◽  
Gabriel G. Larre ◽  
Juliana R. Porto
Keyword(s):  
Growth Pattern ◽  
Sexual Maturity ◽  
Rio Grande ◽  
Allometric Growth ◽  
Rio Grande Do Sul ◽  
Power Equation ◽  
Length Relationship ◽  
First Maturity ◽  
Size At First Maturity

A weight/length relationship was established for Astyanax jacuhiensis (Cope, 1894) (n = 370) and Cheirodon ibicuhiensis Eigenmann, 1915 (n = 701), from samples taken monthly in Fortaleza Lagoon, Cidreira, Rio Grande do Sul, from December 1991 through November 1992. Both species showed a polyphasic allometric growth pattern, each stanza described by an independent power equation controlled by a switch function. For C. ibicuhiensis, this change in the growth pattern occurred at 2.948 cm standard length (SL), close to published sizes for the attainment of female maturity. The change in the growth pattern of A. jacuhiensis (SL = 3.481 cm) was below the predicted size at first maturity, and merits further investigation. Although not conclusive, our data suggest that a complex growth pattern is frequent in nature, and perhaps is not usually identified because trends are obscured by natural variability. Despite the increased complexity resulting from the application of a more-complex equation, the identification of a change in the growth pattern could indicate important aspects of fish biology, including the attainment of sexual maturity.

OBSERVATIONS ON THE RELATIONSHIP BETWEEN THE MAXIMAL THYROXINE BINDING CAPACITIES OF THYROXINE-BINDING INTERALPHA GLOBULIN AND THYROXINE-BINDING PREALBUMIN, THE SERUM PROTEIN BOUND IODINE CONCENTRATION AND SEXUAL MATURITY IN ADOLESCENTS

1967 ◽  
Vol 54 (3) ◽  
pp. 494-504 ◽  
Author(s):  
R. E. Goldsmith ◽  
J. L. Rauh ◽  
R. Kloth ◽  
J. Dahlgren
Keyword(s):  
Serum Protein ◽  
Sexual Maturity ◽  
Binding Capacity ◽  
Iodine Concentration ◽  
The Relationship

ABSTRACT The serum PBI concentration and the maximal thyroxine binding capacity for TBG and TBPA were determined in 100 adolescents. The subjects were classified according to sex and degree of sexual maturity. PBI was determined by an autoanalyzer method: Maximal thyroxine binding capacity for TBG fell with increasing maturation in males while TBPA capacity rose in both sexes. The slight changes in serum PBI noted with increasing sexual maturity correlated directly with the slight changes in TBG binding capacity; no correlation between PBI and TBPA binding capacity was observed as maturity progressed.

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