Distribution Pattern of Seahorse species (Genus: Hippocampus) in Tamilnadu and Kerala Coasts of India

The survey along the Tamilnadu and Kerala coats of India reveled that six species of seahors (Hippocampus fuscus, H. kelloggi, H. kuda, H. histrix H. mohnikei and H. trimaculatus) were distributed with different density. Out of the six species, H. fuscus, H. kuda and H. trimaculatus, were the commonly available species in all the observed areas. In Palk Bay, H. kuda was the dominant species constituting 49.10% of the total seahorses encountered. Hippocampus trimaculatus was the second dominant species which accounting 39.28%. The Gulf of Mannar region also most abounded with H. kuda (68.98%) followed by H. trimaculatus (20.80%), H. fuscus (9.80%), H. kelloggi (2.23%) and H. histrix (0.37%). In Kerala coast, H. trimaculatus was the dominant species (79.68%) followed by H. kuda (9.89%), H. kelloggi (8.33%) and H. fuscus (2.08%). To infer the variation of six seahorse species the morphometric and meristic characters were analysed. The important morphometric and meristic characters are trunk rings, tail rings, pectoral and dorsal fin rays, trunk length, tail length, coronet height, head length, snout length, snout depth and head depth. Variation in overall body shape, relative snout length, coronet height, number of tail ring was sufficient to separate the specimens to Hippocampus fuscus, H. kelloggi, H. kuda, H. histrix H. mohnikei and H.trimaculatus. The species density and diversity depends on the habitat and biogeography of those areas. Majority of seahorse fishing in Tamilnadu was by shrimp trawl, by-catch and very few target catch by divers also seen in some villages of Palk Bay and Gulf of Mannar region. The shrimp trawl by-catch only bringing more H. trimaculatus than the other species in Kerala coasts.

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Production of Novel Bioactive Compounds by the Bacteria Associated with Some Marine Sponges of Gulf of Mannar and Palk Bay, Southeast Coast of India

International Journal of Emerging Research in Management and Technology ◽

10.23956/ijermt.v6i8.136 ◽

2018 ◽

Vol 6 (8) ◽

pp. 183

Author(s):

V. Ramadas ◽

G. Chandralega

Keyword(s):

Bioactive Compounds ◽

Bacterial Species ◽

Marine Sponges ◽

Marine Organisms ◽

Gulf Of Mannar ◽

Bacterial Symbionts ◽

Palk Bay ◽

Excellent Source

Sponges, exclusively are aquatic and mostly marine, are found from the deepest oceans to the edge of the sea. There are approximately 15,000 species of sponges in the world, of which, 150 occur in freshwater, but only about 17 are of commercial value. A total of 486 species of sponges have been identified in India. In the Gulf of Mannar and Palk Bay a maximum of 319 species of sponges have been recorded. It has been proved that marine organisms are excellent source of bioactive secondary metabolites and number of compounds of originated from marine organisms had been reported to possess in-vitro and in-vivo immuno stimulatory activity. Extracts from 20 sponge species were tested for bacterial symbionts and bioactive compounds were isolated from such associated bacterial species in the present study.

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Blue carbon stock of the seagrass meadows of Gulf of Mannar and Palk Bay off Coromandel Coast, south India

Indian Journal of Fisheries ◽

10.21077/ijf.2020.67.4.98101-18 ◽

2020 ◽

Vol 67 (4) ◽

Author(s):

P. Kaladharan ◽

P.U. Zacharia ◽

S. Thirumalaiselvan ◽

A. Anasukoya ◽

Lavanya Ratheesh ◽

...

Keyword(s):

Carbon Stock ◽

South India ◽

Blue Carbon ◽

Gulf Of Mannar ◽

Organic Carbon Content ◽

Seagrass Meadows ◽

Soil Carbon Density ◽

Palk Bay ◽

Syringodium Isoetifolium ◽

Coromandel Coast

Blue carbon stock of the seagrass meadows of Gulf of Mannar and Palk Bay, off Coromandel Coast, south India, were computed from the organic carbon content and dry bulk densities of sediment core taken from the seagrass meadows of these two ecosystems. The Gulf of Mannar (GoM) and Palk Bay (PB) harbour 13 seagrass species dominated by Cymodocea serrulata and Syringodium isoetifolium. The soil carbon density of both GoM and PB were higher in subsurface cores. The blue carbon stock of seagrass meadows of the GoM was estimated as 0.001782 Tg and that of PB as 0.043996 Tg. The estimated value of blue carbon stored in seagrass meadows of GoM was 17820 US$ and that of PB was 43,99,682 US$. The results of this study are discussed in the light of climate change mitigation, emphasising the need to conserve these underwater meadows.

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Genotype, gestation length, season, parity and sex effects on growth traits of two rabbit breeds and their crosses

Biotechnology in Animal Husbandry ◽

10.2298/bah1404717e ◽

2014 ◽

Vol 30 (4) ◽

pp. 717-729 ◽

Cited By ~ 1

Author(s):

S.S.A. Egena ◽

G.N. Akpa ◽

I.C. Alemede ◽

A. Aremu

Keyword(s):

Growth Traits ◽

Tail Length ◽

The Body ◽

Gestation Length ◽

Body Measurements ◽

Season Of Birth ◽

Trunk Length ◽

Body Dimensions ◽

Sex Effects ◽

Foundation Stock

One hundred and thirty rabbits were used to evaluate the effect of genotype, gestation length, season, parity and sex on growth traits of two breeds of rabbit and their crosses. The rabbit used for the experiment were breeds of the New Zealand White (NZW) and Chinchilla (CH) breed. Six breeding bucks (three/breed) and eighteen breeding does (nine/breed) served as the foundation stock. Traits measured include: body weight (BW), nose to shoulder length (NTS), shoulder to tail length (STL), heart girth (HG), trunk length (TL) and length of ear (LE). Results revealed that, BW of the rabbits were influenced (p<0.05) by genotype, gestation length and season. CH x (CH x NZW) progenies had better BW at 35-d and 49-d of age while NZW x CH progenies had better BW at 21-d of age. Kittens born late (32-34 days) had better BW at 21-d, 35-d and 49-d while kittens kindled during early dry season had better BW at 21-d, 35-d and 49-d. Genotype affected (p<0.05) all the body measurements at 21-d, 35-d and 49-d. Gestation length affected (p<0.05) all the body measurements except for NTS at 21-d and HG at 49-d respectively. Season of birth also influenced (p<0.05) all the body measurements except for LE 21-d. Parity and sex had no effect (p>0.05) on BW, NTS, STL, HG, TL and LE. It was concluded that genotype, gestation length and season influenced BW and body dimensions of the two breeds of rabbit and their crosses while parity and sex had no effect.

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By-catch Landing of Lambis Gastropods in Gulf of Mannar Coast,Tamil Nadu

Indian Journal of Science and Technology ◽

10.17485/ijst/2014/v7i10.25 ◽

2014 ◽

Vol 7 (10) ◽

pp. 1509-1512 ◽

Cited By ~ 1

Author(s):

Lidwin Annamary

Keyword(s):

Tamil Nadu ◽

Gulf Of Mannar ◽

By Catch

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Three New distributional records of Pen Shells (Bivalvia: Pinnidae) from Seagrass beds of Palk Bay Area in Tamil Nadu

Sustainability Agri Food and Environmental Research ◽

10.7770/safer-v3n1-art881 ◽

2015 ◽

Vol 3 (1) ◽

Author(s):

Chelladurai Stella ◽

Packiam Paul ◽

Chelladurai Ragunathan

Keyword(s):

Tamil Nadu ◽

Taxonomic Status ◽

Intertidal Area ◽

Meristic Characters ◽

Hard Substratum ◽

Bay Area ◽

The Family ◽

Tidal Area ◽

Palk Bay ◽

First Time

The new occurrence of Three species of bivalves from Pinnidae family is recorded for the first time from Palk Bay area based on a live and dead shells collected from the Intertidal area . All the three species are under the family of Pinnidae, Pinna bicolor, Pinna deltodes and Pinna incurva . In seagrass bed of Thondi Coast, all the species of Pen shells Pinna bicolor, Pinna deltodes and Pinna incurva were embedded in muddy sand and found associated with seagrasses at inter-tidal area. It was also found buried in hard substratum associated with living zoanthids and soft coral. The collected specimens were identified as, (1) Pinna bicolor, (2) Pinna deltodes and (3) Pinna Incurva by using both morphometric and meristic characters. The paper described the taxonomic status and the description of the three species of bivalves collected from Palk Bay areas.

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Quantitative genetics and the evolution of ontogeny: I. Ontogenetic changes in quantitative genetic variance components in randombred mice

Genetics Research ◽

10.1017/s0016672300021492 ◽

1983 ◽

Vol 42 (1) ◽

pp. 65-75 ◽

Cited By ~ 33

Author(s):

James M. Cheverud ◽

Larry J. Leamy ◽

William R. Atchley ◽

J. J. Rutledge

Keyword(s):

Maternal Effects ◽

Environmental Effects ◽

Variance Components ◽

Genetic Variance ◽

Tail Length ◽

Head Length ◽

Ontogenetic Changes ◽

Trunk Length ◽

Quantitative Genetic ◽

Significant Difference

SUMMARYWe report the results of an ontogenetic analysis of quantitative genetic variance components with two replicates drawn from the randombred ICR strain of mice. A total of 432 mice from 108 full-sib families raised in a cross-fostering design were used to estimate direct effects heritability, maternal effects, and environmental effects for weight, head length, trunk length, trunk circumference, and tail length at 17, 24, 31, 38, 45, 52, 59, and 66 days of age. There was no significant difference in heritability between the replicates. Heritabilities either stayed more or less constant with age at about 0·30 (weight, trunk length, trunk circumference) or increased slightly with age (head length, tail length). Maternal effects decreased with age from a maximum of about 0·50 at weaning to about 0·15 at age 66 when growth was nearly complete. Environmental effects increased in relative importance during ontogeny.

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