Investigations on selected ecological parameters of Tuticorin Bay, Gulf of Mannar, south-east coast of India with emphasis on suitability for mariculture

2021 ◽  
Vol 68 (3) ◽  
Author(s):  
P. S. Asha ◽  
K. Diwakar ◽  
A. Usharani ◽  
D. Prema
Keyword(s):  
East Coast ◽  
Gulf Of Mannar ◽  
East Coast Of India ◽  
Ecological Parameters

scholarly journals Ehinoid landings at Mandapam, south-east coast of India with a note on gonadal maturity of two species of sea urchins

2017 ◽  
Vol 64 ◽  
Author(s):  
R. Saravanan ◽  
P. Jawahar ◽  
T. Francis ◽  
B. Ahilan ◽  
R. Santhakumar ◽  
...  
Keyword(s):  
Tamil Nadu ◽  
East Coast ◽  
Sea Urchins ◽  
Marine Ecosystem ◽  
Gonad Index ◽  
Future Research ◽  
Gulf Of Mannar ◽  
East Coast Of India ◽  
Gonadal Maturity ◽  
Suitable Environment

The sea urchins, belonging to phylum Echinodermata, are a good source of “roe”, (gonads) and are being consumed by humans since pre-historic times. In many countries of the world, it is a delicacy among the food items and in retail markets in Japan, it is sold at prices as high as US$ 600 kg-1. Among the 800 species of echinoids, 105 species are found along the east coast of India and 30 species are recorded along the coast of Tamil Nadu. There is a paucity of information on the biology and ecology of sea urchins and lack of studies on its edibility and palatability. The sea urchin aquaculture called as echiniculture is picking up in subtropics and temperate areas. Importantly, the tropical marine ecosystem of India, which supports diverse flora and fauna is a suitable environment for echiniculture, and the future research needs to be focused to find out the potential species and developing techniques for their aquaculture. The present investigation analysed the landings of echinoderms in the Gulf of Mannar and Palk Bay along the south-east coast of India and also studied the gonadal maturity of two species of sea urchins viz., Salmacis virgulata and Temnopleurus toreumaticus in order to assess their suitability for echiniculture. S. virgulata and T. toreumaticus formed 70 and 30% respectively of the sea urchins landings at Vedalai and Pampan landing centres. The overall sex ratio of both the species did not deviate significantly from 1:1. In S. virgulata the mean monthly gonad index was highest (9.62±0.46) during September 2014 and for T. toreumaticus, the peak GSI was observed during December 2013. Further studies on captive maturation and breeding are needed to explore the potential of these species for echiniculture.

scholarly journals Spatial variations in the population characteristics of sea cucumber resources in Gulf of Mannar and Palk Bay, south-east coast of India

2019 ◽  
Vol 66 (3) ◽  
Author(s):  
P.S. Asha ◽  
L. Ranjith ◽  
E. Vivekanandan ◽  
B. Johnson ◽  
C.S. Subin ◽  
...  
Keyword(s):  
Sea Cucumber ◽  
East Coast ◽  
Average Length ◽  
Average Density ◽  
Population Characteristics ◽  
Individual Species ◽  
Gulf Of Mannar ◽  
East Coast Of India ◽  
Indian Waters ◽  
Palk Bay

The lack of data on population abundance, biomass and basic biological parameters of most of the sea cucumber species from Indian waters is a fundamental barrier to impose suitable management measures on these resources. A study was conducted to ascertain the sea cucumber population characteristics in two geographically distinct ecosystems (Gulf of Mannar and Palk Bay) along the south-east coast of India. The stock status of sea cucumber population was assessed both by trawl and dive surveys following standard methods on a random basis. Comparatively, a higher average density of total sea cucumbers was estimated in the Gulf of Mannar (3853±152.3 nos. ha-1) than in Palk Bay (2428.5±504.6 nos. ha-1). The species diversity, average length and weight of individual species were also higher in the Gulf of Mannar. The present study indicated significant variation in status and structure of sea cucumber resources in these two ecosystems. Hence the study warrants the emphasis of ecosystem-based management in formulating conservation measures of these resources in Indian waters.

scholarly journals Diversity of reef associated fishes in hook and line fishery at Mandapam, Gulf of Mannar, south-east coast of India

2019 ◽  
Vol 66 (2) ◽  
Author(s):  
Molly Varghese ◽  
A. Gandhi
Keyword(s):  
Significant Variation ◽  
Tamil Nadu ◽  
East Coast ◽  
Diversity Index ◽  
Gulf Of Mannar ◽  
Taxonomic Distinctness ◽  
East Coast Of India ◽  
Normal Limits ◽  
Sphyraena Barracuda ◽  
Funnel Plots

Reef associated fishes landed by hooks and lines at Mandapam landing centre in Ramanathapuram District, Tamil Nadu for a period of four years from October 2008 to May 2012 were studied based on fortnightly samplings. The hook and line fishing is seasonal in Gulf of Mannar and lasts for six months annually from October - November to April - May, as this area remains rough during the rest of the year. The average annual landing of fish during the study period was 171 t with a peak of 295 t in 2008-09 and showed a decline since then. A total of 32 species of reef associated fishes belonging to 14 families were landed. Among them, Sphyraena barracuda contributed the maximum with a share of 42% followed by Caranx heberi (15%). Family-wise landings indicated the dominance of Sphyraenidae (46%). The diversity index (H’) was the highest during 2008-09 and the evenness of distribution of individuals among different species did not show significant variation in different years. Funnel plots of average taxonomic distinctness (∆+ ) and variation in taxonomic distinctness (λ+ ) indicated that the values in most of the years are within the normal limits.

Length‐weight relationship of six coastal fish species from Gulf of Mannar, South‐east coast of India

2020 ◽  
Vol 36 (3) ◽  
pp. 364-365 ◽  
Author(s):  
Sivadas Madhavan ◽  
Suresh Kumar Karuppiah ◽  
Kannan Karuppiah
Keyword(s):  
Fish Species ◽  
East Coast ◽  
Gulf Of Mannar ◽  
Coastal Fish ◽  
East Coast Of India ◽  
Weight Relationship ◽  
Relationship Of

scholarly journals Influence of Sea Surface Temperature on the Gonadal Development of Sea Urchin Temnopleurus Toreumaticus from the Gulf of Mannar, South East Coast of India

2016 ◽  
Vol 11 (1) ◽  
pp. 133-141
Author(s):  
Raju Saravanan ◽  
Paulraj Jawahar ◽  
Thommai Francis ◽  
Baboonsundaram Ahilan ◽  
Rajagopal Santhakumar
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Sea Urchin ◽  
East Coast ◽  
Abiotic Factors ◽  
Gonad Index ◽  
Gonadal Development ◽  
Sea Surface ◽  
Gulf Of Mannar ◽  
East Coast Of India

This study was conducted for a 20 months period from October 2013 to May 2015 in Gulf of Mannar, south east coast of India. During the investigation the abiotic factors viz., Sea surface temperature (SST), Daylight photoperiod and atmospheric temperature data were collected from International comprehensive Ocean Atmospheric Database (ICOADS) and the reproductive cycle of the sea urchin was studied from the monthly sampling of sea urchin collected from Vedalai landing centre in Gulf of Mannar. The gonads were studied to calculate Gonad index as well histological to categories them into four different stages of the development and this data was compared with abiotic factors to study the influence of it on the reproductive behavior of sea urchin. The data were analyzed statistically through Pearson correlation and it was found negative between mean monthly gonad index and day length photoperiod, as well as with SST. This clearly indicates that the gonadal development in sea urchin is very much influenced by these two abiotic factors; however other nutritional factors might play greater role in the development gonad.

In vitro snake venom detoxifying action of some marine algae of Gulf of Mannar, south-east coast of India

2003 ◽  
Vol 17 (10) ◽  
pp. 1217-1219 ◽  
Author(s):  
Hannah R. Vasanthi ◽  
A. Jaswanth ◽  
V. Krishnaraj ◽  
G. V. Rajamanickam ◽  
A. Saraswathy
Keyword(s):  
Snake Venom ◽  
Marine Algae ◽  
East Coast ◽  
Gulf Of Mannar ◽  
East Coast Of India

scholarly journals COMPARATIVE STUDY OF MARINE ALGAE ISOLATED FROM EAST COAST OF INDIA BY REDUCING POWER ASSAY

2017 ◽  
Vol 5 (4RAST) ◽  
pp. 73-79
Author(s):  
Leelavathi M S ◽  
Prasad M P
Keyword(s):  
Petroleum Ether ◽  
East Coast ◽  
Petroleum Ether Extract ◽  
Reducing Power ◽  
Fine Powder ◽  
Renewable Resource ◽  
Gulf Of Mannar ◽  
Ether Extract ◽  
East Coast Of India ◽  
Reducing Power Assay

The Gulf of Mannar is a Marine Biosphere Reserve situated along the east coast of India and Sri Lanka, an area of about 10,500 sq. km which has a luxuriant growth of about 680 species of seaweed belonging to the Rhodophyta, Pheaophyta and Chlorophyta, in both the inter-tidal and deep water regions. Seaweed constitutes a commercially important marine renewable resource. Seaweeds are rich in polysaccharides, minerals, proteins and vitamins. Documented antioxidant activity would elevate their value in the human diet as food and pharmaceutical supplements thus, in the present investigation the sea weed samples were collected in sterile condition and their antioxidant property for methanolic and petroleum ether extract was carried out by reducing power assay. The extraction process was carried out by drying and extracted the fine powder with different solvents. The extracted samples were then dissolved to a stock concentration of 1mg/ml and the reducing power assay was carried out with different concentrations of the sample.The methanolic extract of Cymodoceaeserrulata, Gracillariafolifera and Turbinariaconoides showed higher reducing power when compared to the standard.The petroleum ether extract of Cymodoceaerotundata and Ulvareticulata extracts showed higher activity when compared to the standard whereas Kappaphycussps showed the least activity when checked for its reducing power activity.

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