Reproductive biology and management of two commercially important groupers in the SW Atlantic

2017 ◽  
Vol 101 (1) ◽  
pp. 79-94 ◽  
Author(s):  
Matheus O. Freitas ◽  
Marilia Previero ◽  
Carolina V. Minte-Vera ◽  
Henry L. Spach ◽  
Ronaldo B. Francini-Filho ◽  
...  
Keyword(s):  
Reproductive Biology ◽  
Sw Atlantic ◽  
Commercially Important

scholarly journals Reproductive biology of the orange mud crab Scylla olivacea (Herbst, 1796) from the Pichavaram mangroves of south-east India

2019 ◽  
Vol 66 (1) ◽  
Author(s):  
C. Viswanathan ◽  
M. Pravinkumar ◽  
T.V. Suresh ◽  
V. Elumalai ◽  
S.M. Raffi
Keyword(s):  
Sex Ratio ◽  
Size Distribution ◽  
Reproductive Biology ◽  
Sexual Maturity ◽  
Carapace Width ◽  
Distribution Analysis ◽  
Mud Crab ◽  
Indian Coast ◽  
Ratio Size ◽  
Commercially Important

The present study was conducted to assess the size distribution, sex ratio, size at first sexual maturity, fecundity and spawning season of the commercially important orange mud crab Scylla olivacea (Herbst, 1796) in Pichavaram mangroves in south-east India. This study is the first contribution to the knowledge of reproductive biology of S. olivacea from the Indian coast. Size distribution analysis in the fishery revealed the irrational exploitation of undersized S. olivacea. The estimated sex ratio deviated from equality, being 1:0.87, revealing a male domination. Size at first sexual maturity was determined to be 87 mm in carapace width (CW) in females. Fecundity ranged from 1.16 to 3.53 million in females of 76 to 135 mm CW. Breeding takes place year-round with a peak in pre-monsoon, indicating that it is a prolific breeder. Results revealed that immature individuals of S. olivacea contributed significantly to the catches and thus an effective management of the resource by framing minimum legal size is crucial so that the females are allowed to spawn at least once prior to capture.

scholarly journals Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

2010 ◽  
Vol 8 (2) ◽  
pp. 333-340 ◽  
Author(s):  
Nayara Barbosa Santos ◽  
Rossineide Martins da Rocha ◽  
Flávia Lucena Fredóu
Keyword(s):  
Sex Ratio ◽  
Reproductive Biology ◽  
Gonadal Development ◽  
Development Stage ◽  
Spawning Period ◽  
Length Relationship ◽  
Amazon Estuary ◽  
Microscopic Evaluation ◽  
Commercially Important ◽  
Number Of Individuals

Plagioscion magdalenae (pacora) is a commercially important benthopelagic sciaenid and widely distributed in the Amazon River basin. The present study describes the reproductive biology of this species in the bay of Marajo, Amazon Estuary, Brazil. The gonadal development stage, age and size at first sexual maturity (L50), sex ratio, and reproductive strategy were determined. The data were collected bi-monthly from December 2005 to October 2006. A total of 251 specimens were examined, with the total length (TL) ranging between 220 and 590 mm. The weight-length relationship for females, males and grouped sexes was highly significant, showing a positive allometry. The L50 was of 279 mm for grouped sexes, with 305 mm and 269 mm TL for females and males respectively. The sex ratio for the total number of individuals favored the males (2.02 males: 1 female). Macroscopically, the gonads were classified as immature, maturing, mature and spent. Considering the macro and microscopic evaluation of the gonads, an extended spawning period, mainly in August to February, was observed.

scholarly journals The reproductive biology and cycle of Rioraja agassizi (Müller and Henle, 1841) (Chondrichthyes: Rajidae) in southeastern Brazil, SW Atlantic Ocean

2007 ◽  
Vol 71 (3) ◽  
pp. 593-604 ◽  
Author(s):  
María Cristina Oddone ◽  
Alberto F. Amorim ◽  
Patricia L. Mancini ◽  
Walter Norbis ◽  
Gonzalo Velasco
Keyword(s):  
Atlantic Ocean ◽  
Reproductive Biology ◽  
Southeastern Brazil ◽  
Sw Atlantic

Gonad rematuration and reproductive cycle of the mud clam Anodontia edentula in Guimaras, Central Philippines

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
MILESSA H. ARGAŇOZA ◽  
JANE S. GEDUSPAN
Keyword(s):  
Survival Rate ◽  
Laboratory Condition ◽  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Gonadosomatic Index ◽  
Human Consumption ◽  
Extrinsic Factors ◽  
Commercially Important ◽  
Intrinsic And Extrinsic Factors

Anodondia edentula locally known as imbao bayi is a commercially important mud clam harvested for human consumption in Central Philippines. Since it is used as a source of food and livelihood to the local gleaners, it was observed that fewer and smaller mud clams have been harvested. Thus, regulating proper collection of this organism and a sound knowledge of its reproductive cycle are necessary. This study aimed to describe some aspects of the reproductive biology of A. edentula. Fifty mud clams were collected and dissected every month. Monthly monitoring of the gonadosomatic index in the study shows that A. edentula spawns throughout the year. Under laboratory condition, male has shorter gonadal rematuration than females. Spent male A. edentula that spawned will spawn again after three weeks through serotonin injection while females will spawn gain after six weeks as long as intrinsic and extrinsic factors are met. This type of maturation schedule suggests continuous reproductive competence. Higher spawning rate is obtained in clams reared with mud substrate than without mud substrate , but the survival rate was found to be higher for clam reared without mud substrate than with mud substrate. Results of this study provide useful information for the management and aquaculture of this bivalve species.Keywords: Biology, gonad rematuration, reproductive cycle, Anodontia edentula, gonadosomaticindex, gonadal rematuration, serotonin, spawning, mud substrate, experimentaldesign, Guimaras, Central Philippines

scholarly journals Size at maturity of the smallnose fanskate Sympterygia bonapartii (Müller & Henle, 1841) (Pisces, Elasmobranchii, Rajidae) in the SW Atlantic

2004 ◽  
Vol 61 (2) ◽  
pp. 293-296 ◽  
Author(s):  
María Cristina Oddone ◽  
Gonzalo Velasco
Keyword(s):  
Sexual Maturity ◽  
Size At Maturity ◽  
Southern Brazil ◽  
Important Target ◽  
Sw Atlantic ◽  
Commercially Important

Abstract The smallnose fanskate Sympterygia bonapartii is found in coastal and shelf waters between southern Brazil and southern Argentina. Since 1994 it has become an alternative and commercially important target of demersal fisheries. In Uruguayan waters, the onset of sexual maturity in the species is at 65.5 cm for females and at 50–57 cm for males.

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