Reproductive Biology of the Commercially Important Portunid Crab, Portunus sanguinolentus (Herbst)

2013 ◽  
Vol 03 (02) ◽  
Author(s):  
Soundarapandian P Varadharajan D
Keyword(s):  
Reproductive Biology ◽  
Portunid Crab ◽  
Commercially Important

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.

Cheliped abnormality and embryonic development of commercially important portunid crab Portunus sanguinolentus (L.)

2016 ◽  
Vol 5 (11) ◽  
pp. 5097
Author(s):  
Bilal Ahmad Bhat ◽  
Mushtaq Ahmed Parray* ◽  
Sartaj Ahmad Allayie ◽  
Ravichandran S.
Keyword(s):  
Embryonic Development ◽  
The Body ◽  
Yolk Granules ◽  
Golden Yellow ◽  
Portunid Crab ◽  
Undifferentiated Cells ◽  
Deep Yellow ◽  
Commercially Important ◽  
Egg Diameter ◽  
Yellowish Orange

In the present study an attempt was made to study the cheliped abnormalty of commercially important crab, Portunus sanguinolentus. The newly spawned eggs were round and golden yellow in colour. The undeveloped and mass of undifferentiated cells were also found in the berry. The yolk granules were denser. The cleavage and gastrulation were not clear. The diameter of the freshly laid egg was 0.34mm. The multicell eggs were round, deep yellow or yellowish orange in colour. The space between the egg wall and the inner developing embryo was visible. The diameter of the egg was 0.41mm. The eye stage eggs were round and orange in colour. The yolk granules were not denser. The egg diameter was 0.48mm. The pigment stage eggs were brown in colour. The egg diameter was 0.57 mm. The diameter of the egg was 0.64 mm. In prehatching stage the rate of heartbeat was increased and the chromatophores were also found increased throughout the body. The diameter of the egg was 0.73mm. Hence in the present study both the embryonic as well abnormality of cheliped was under taken in to the consideration.

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

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