Indian Council of Agricultural Research
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Experimental studies on Macro fouling communities on net panels at marine cage farm of Karwar, India

Experimental studies on Macro fouling communities on net panels at marine cage farm of Karwar, India - CMFRI Repository

A study was undertaken on the fouling pattern, monthly settlement and species dominance at marine cage culture during the year 2014-2015. The net panels deployed at three different depths during December 2014 and the study was carried out for seven months. The study revealed wide variations in colonization of the bio-foulers, the density varied between 2-260/cm2. The overall density was found to be more in bottom panels (6mt) compared to the top (1mt) and middle panels (3mt). The overall dominant species were hydroids and barnacles throughout the culture period. In the top panels, hydroids were dominant (91.67%) during December, followed by barnacles and amphipods. Additionally, complete dominance of barnacles was observed in the middle panel during May. Barnacles were found dominant (93.75%) on the bottom panels during March, followed by hydroids and crabs. The study underscored that barnacles formed a major contribution of the fouling organisms throughout the culture period. Significant variation in the occurrence and abundance of fouling organisms was observed, between the depths at cage site.

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First record of the Longfin Gaper, Champsodon Longipinnis Matsubara and Amaoka, 1964 along Indian coast

First Record of the Longfin Gaper, Champsodon Longipinnis Matsubara and Amaoka, 1964 (Family: Champsodontidae) Along Indian Coast - CMFRI Repository

Four specimens of the longfin gaper, Champsodon longipinnis, were caught by commercial trawlers off Gopalpur, Odisha coast and landed at Visakhapatnam fishing harbor on 23rd December 2014. The morphometric and meristic characters of the recorded specimens are described and discussed. This is the first occurrence of the species from Indian waters, exhibiting an extension in distribution within the Indian Ocean.

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Molecular and morphological descriptions of Ceratomyxa collarae n. sp. and Ceratomyxa leucosternoni n. sp. from marine ornamental fishes

Molecular and morphological descriptions of Ceratomyxa collarae n. sp. and Ceratomyxa leucosternoni n. sp. from marine ornamental fishes of Indian waters - CMFRI Repository

Two novel species of Ceratomyxa infecting marine ornamental fishes from Indian waters are described. Marine ornamentals, Chaetodon collare and Chaetodon decussatus, collected from Vizhinjam, along the southwest coast of India and Acanthurus leucosternon collected from Lakshadweep islands ofArabian Sea revealed Ceratomyxa infections in their gall bladders. Mature spores of Ceratomyxa from Chaetodon collare and Chaetodon decussatus were elongate and slightly crescentic, with rounded ends, and measured 5.20± 0.32 μm in length and 16.32 ± 1.29 μm in thickness. Polar capsules spherical, equal in size and measured 2.23 ± 0.16 μm long and 2.24± 0.20 μm wide. Posterior angle measured 157.75 ± 8.650. Principle Component Analysis and molecular analysis using partial SSUrDNA sequences showed the isolates from these two hosts to be identical. Morphological, morphometric and molecular analysis using partial SSUrDNA sequences revealed the taxonomic novelty of isolates and are hence treated as Ceratomyxa collarae n. sp. Mature spores of Ceratomyxa from Acanthurus leucosternon were elongate, slightly tapering with rounded ends, and measured 7.34 ±0.92 μm in length and 24.37 ± 2.34 μm in thickness. Shell valves were equal, joined by a narrow suture line. Polar capsules spherical in shape, equal in size, 2.59±0.32 μm long and 2.46 ± 0.32 μm wide, and polar filament measured 18.68 ±2.54 μm. Based on morphological, morphometric and molecular analyses, the present species of Ceratomyxa is distinct, considered as a new species and named Ceratomyxa leucosternoni n. sp. The paper also discusses the prevalence of the recovered parasites and host specificity of Ceratomyxa collarae n. sp.

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Non-indigenous sea slug Tenellia adspersa in the southeast coast of the Arabian Sea, India.

Non-indigenous sea slug Tenellia adspersa in the southeast coast of the Arabian Sea, India - CMFRI Repository

Nudibranchs are gastropod molluscs belonging to suborder Opisthobranchia. They are easily identified based on their shell-less bodies and a pair of rhinophores (tentacles) on the dorsal side of the head. These organisms are stunningly colourful, hence are often called ‘butterflies of the ocean’. About 3000 species of Nudibranchs are known globally1, and 311 species have been reported from India2. Tenellia adspersa is a tiny nudibranch, commonly known as lagoon sea slug or miniature aeolis.

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First Record of Abnormal Hermaphroditism in the Common Dolphin Fish, Coryphaena hippurus

First Record of Abnormal Hermaphroditism in the Common Dolphin Fish, Coryphaena hippurus (Linnaeus, 1758) - CMFRI Repository

In this communication, an abnormally hermaphroditic specimen of common dolphin fish, Coryphaena hippurus, is reported from Indian waters. Morphological and histological studies clearly revealed the presence of developing ovary and testis with series of gametogenetic cells. This is the first case of hermaphroditism in common dolphin fish.

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Antimicrobial polyketide furanoterpenoids from seaweed-associated heterotrophic bacterium Bacillus subtilis

Antimicrobial polyketide furanoterpenoids from seaweed-associated heterotrophic bacterium Bacillus subtilis MTCC 10403 - CMFRI Repository

Brown seaweed Anthophycus longifolius (Turner) Kützing (family Sargassaceae) associated heterotrophic bacterium Bacillus subtilis MTCC 10403 was found to be a potent isolate with broad range of antibacterial activity against important perceptive food pathogens Vibrio parahaemolyticus, V. vulnificus, and Aeromonas hydrophila. This bacterium was positive for polyketide synthetase gene (KC589397), and therefore, was selected to bioprospect specialized metabolites bearing polyketide backbone. Bioactivity-guided chromatographic fractionation of the ethyl acetate extract of the seaweed-associated bacterium segregated four homologous polyketide furanoterpenoids with potential antibacterial activities against clinically important pathogens. The minimum inhibitory concentration (MIC) assay showed that the referral antibiotics tetracycline and ampicillin were active at 25 mg/mL against the test pathogens, whereas the previously undescribed (4E)-methyl 13-((16-(furan-2-yl) ethyl)-octahydro-7-hydroxy-4-((E)-23- methylbut-21-enyl)-2H-chromen-6-yl)-4-methylpent-4-enoate (compound 1) and methyl 3-(hexahydro- 9-((E)-3-methylpent-1-enyl)-4H-furo[3,2-g]isochromen-6-yl) propanoate (compound 3) displayed antibacterial activities against the test pathogens at a lesser concentration (MIC < 7 mg/mL). The title compounds were characterized by comprehensive nuclear magnetic resonance and mass spectroscopic experiments. Polyketide synthase catalyzed putative biosynthetic mechanism additionally corroborated the structural ascriptions of the hitherto undescribed furanoterpenoids from seaweed-associated bacterial symbiont. The electronic and hydrophobic parameters appeared to hold a conspicuous part in directing the antibacterial properties of the compounds. Seaweed-associated B. subtilis MTCC 10403 demonstrated to represent a potential source of antimicrobial polyketides for pharmaceutical applications.

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