scholarly journals Reproductive biology of Nemipterus japonicus (Bloch, 1791) in the trawl grounds along the north-east coast of India

2017 ◽  
Vol 64 (4) ◽  
Author(s):  
M. V. Hanumantha Rao ◽  
Shubhadeep Ghosh ◽  
K. Sreeramulu ◽  
V. U. Mahesh ◽  
M. Satish Kumar ◽  
...  
Keyword(s):  
Reproductive Biology ◽  
East Coast ◽  
Diameter Distribution ◽  
East Coast Of India ◽  
North East ◽  
The North ◽  
Nemipterus Japonicus ◽  
First Maturity ◽  
Somatic Index ◽  
Size At First Maturity

The reproductive biology of Nemipterus japonicus (Bloch, 1791) along the north-east coast of India was studied during 2012-2015 based on samples from the trawl landings at Digha, Paradeep, Visakhapatnam and Kakinada. Adults dominated the landings. Significant contribution by females was observed in most months of the year. Size at first maturity for females was 15.1 cm. Peak spawning season was during August to February and September to March in the northern and southern regions. Maturity and gonado-somatic index (GSI) were found to correlate well with sea surface temperature (SST). Fecundity increased with length and weight and varied from 13,176 to 1,30,798. Ova diameter distribution indicated the species to be a multiple/batch spawner.

scholarly journals Trophodynamics of Nemipterus japonicus (Bloch, 1791) in the trawl landings along the north-east coast of India

2017 ◽  
Vol 64 (3) ◽  
Author(s):  
M. V. Hanumantha Rao ◽  
Shubhadeep Ghosh ◽  
K. Sreeramulu ◽  
V. U. Mahesh ◽  
M. Satish Kumar ◽  
...  
Keyword(s):  
East Coast ◽  
Northern Region ◽  
Southern Region ◽  
Feeding Intensity ◽  
East Coast Of India ◽  
North East ◽  
The North ◽  
Nemipterus Japonicus ◽  
Index Of Relative Importance ◽  
Mean Similarity

The trophodynamics of Nemipterus japonicus (Bloch, 1791) along the north-east coast of India was studied during 2012-2015 based on specimens collected from trawl landings at Digha, Paradeep (northern region), Visakhapatnam and Kakinada (southern region). Crustaceans were the preferred prey with index of relative importance (IRI) of 50% in the northern region and 42.4% in the southern region. Among crustaceans, Oratosquilla dominated in both the regions followed by crabs and several species of penaeids and nonpenaeids. Finfishes ranked next in importance (IRI% of 32.1 in northern region and 39.9 in southern region) and included Stolephorus spp., silverbellies, Coilia sp., other clupeids, Apogon spp., mackerel, sardines, eels, priacanthids, Bregmaceros sp. and sciaenids. Along northern region, in juveniles and preadults, the diet comprised chiefly of crustaceans (IRI% of 72.27 and 52.76), followed by finfishes (IRI% of 15.37 and 27.65). In the southern region, adult fishes exhibited higher preference for finfishes (IRI% of 47.5 to 62.8). Feeding intensity was low throughout the year with close to half (48.23% in northern region and 43.67% in southern region) of the fishes exhibiting empty or trace stomach conditions which increased with an increase in age and size of fish. High similarity of 75.54% in the northern and 84.19% in the southern region was recorded in the diet contents of smaller and moderate sized adults. Annual and seasonal mean similarity in the diet components between the regions was 69.9 and 53%. Prey contents in juveniles between both the regions exhibited a similarity of 59.5%, while preadults and adults recorded similarities of 62.7 and 68.2% respectively.

scholarly journals First record of the African spadefish, Tripterodon orbis Playfair, 1867 (family: Ephippidae) from the north-east coast of India

2015 ◽  
Vol 8 ◽  
Author(s):  
Pralaya Ranjan Behera ◽  
Shubhadeep Ghosh ◽  
M. Satish Kumar
Keyword(s):  
East Coast ◽  
First Record ◽  
Northern Region ◽  
Single Specimen ◽  
Meristic Characters ◽  
East Coast Of India ◽  
North East ◽  
The North ◽  
Gill Net ◽  
First Occurrence

A single specimen of the African spadefish,Tripterodon orbis, was landed in a gill net operating off Visakhapatnam on 13 December 2013. The morphometric and meristic characters of the recorded specimen are described and discussed herein. This is the first occurrence of the species from the north-east coast of India, exhibiting an extension in distribution from the southern to the northern region, along the Bay of Bengal.

Effects of climate change and management policies on marine fisheries productivity in the north-east coast of India

2020 ◽  
Vol 724 ◽  
pp. 138082 ◽  
Author(s):  
Isha Das ◽  
Valentina Lauria ◽  
Susan Kay ◽  
Ignacio Cazcarro ◽  
Iñaki Arto ◽  
...  
Keyword(s):  
Climate Change ◽  
East Coast ◽  
Marine Fisheries ◽  
East Coast Of India ◽  
North East ◽  
The North ◽  
Management Policies

Reproductive characteristics of the freshwater shrimp, Macrobrachium macrobrachion (Herklots, 1851) in the water bodies of Benin, West Africa

Crustaceana ◽  
2019 ◽  
Vol 92 (3) ◽  
pp. 269-294
Author(s):  
G. Koussovi ◽  
F. Niass ◽  
C. A. Bonou ◽  
E. Montchowui
Keyword(s):  
West Africa ◽  
Reproductive Biology ◽  
Breeding Season ◽  
Developmental Stages ◽  
Freshwater Shrimp ◽  
Breeding Parameters ◽  
The One ◽  
First Maturity ◽  
Somatic Index ◽  
Size At First Maturity

Abstract The palaemonid shrimp Macrobrachium macrobrachion is widely distributed in coastal rivers, estuaries and inland waters of West Africa. This species is economically important because it is the one of the two main freshwater shrimp commercially exploited by artisanal fisheries in southern Benin, besides showing great potential for aquaculture. Despite this, little is known about its reproductive biology in the natural environment. Considering these facts, the present study aimed to establish some breeding parameters for M. macrobrachion in Benin. Overall, 2424 specimens were collected between May 2015 and October 2016. Monthly changes in gonado-somatic index (GSI) and hepato-somatic index (HSI) suggest that the breeding season runs from July to October. In the Ouémé River Delta, the estimated size at first maturity is 8.16 cm TL in females, while it is 7.47 cm TL in males. In the Mono River/Grand-Popo Lagoon complex, the size at first maturity is 7.27 cm TL in females while it is 6.56 cm TL in males. The structure of the ovary as observed in females from either site just before spawning, shows the presence of two types of oocytes at different sizes and various developmental stages. Analysis of such ovarian structure suggests that M. macrobrachion has a synchronous oogenesis with a breeding season limited to a few months of the year. Fecundity was found to be between 3144 and 26 489 eggs in the Ouémé Delta, while it goes from 3124 to 22 660 eggs in the Mono River/Grand-Popo Lagoon complex. The present study provides important information on the reproductive biology of M. macrobrachion and of freshwater shrimp in general, and can also serve as a significant foundation for the aquaculture of species of freshwater shrimp.

scholarly journals The band fish Acanthocepola indica (Perciformes: Cepolidae) in the Northern Bay of Bengal, India

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Alakesh Pradhan ◽  
Bijay K. Mahapatra
Keyword(s):  
Bay Of Bengal ◽  
East Coast ◽  
Single Specimen ◽  
East Coast Of India ◽  
North East ◽  
The North ◽  
Northern Bay Of Bengal ◽  
First Time

A relatively poorly known species of band fish, Acanthocepola indica (Cepolidae), is reported for the first time from the north-east coast of India, Bay of Bengal, based on single specimen 236,86mm long, collected in Digha. We include a detailed, illustrated description of the specimen

Distribution and reproductive biology Of Corophium insidiosum (Amphipoda) on the north-east coast of England

1978 ◽  
Vol 58 (3) ◽  
pp. 585-596 ◽  
Author(s):  
Martin Sheader
Keyword(s):  
Reproductive Biology ◽  
Egg Production ◽  
East Coast ◽  
Feeding Activity ◽  
North East ◽  
Corophium Insidiosum ◽  
The North ◽  
High Turbidity ◽  
The Times

The distributions of Corophium insidiosum and C. bonnellii on the shores of Northumberland and Tyne and Wear suggest the former species to be common in areas of high turbidity, and the latter species in relatively clean conditions. In C. insidiosum breeding takes place throughout the year except during the months of November and December when mature females enter a ‘resting’ stage and immature females delay the onset of maturity. There are two main generations per year. Egg production is linked to a semi-lunar rhythm with peaks around the times of spring tides. Fecundity, brood mortality and feeding activity each vary seasonally.

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