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Revival of Ribbonfish fishery in Mandapam region

During the 60s, ribbonfish formed a fishery of considerable strength in the Mandapam region and occasionally large quantities were landed in shore seines and drift gill nets. Though it is generally observed that large schools of T. lepturus which contribute to the commercial fishery during certain months at different landing centres mostly comprise of spent fish measuring above 50 cm length, neither the schooling behaviour nor the migratory pattern are understood to any appreciable extent. The presently reported shoaling is apparently associated with spawning. This aspect apart from the present observation is noteworthy that a virtually extinct ribbonfish fishery in the Mandapam region has shown a brief but significant revival

Record size tongue sole fish recorded from Mandapam

A specimen of large scaled tongue sole Cynoglossus macrolepidotus (Bleeker), larger than hitherto reported size, was collected by trawl at Mandapam in Oct. ' 9 1

Development of oocytes to maturity and spawning

Spawning in fishes is closely associated with the development of intra-ovarian eggs. Measurements of diameters of intra-ovarian eggs have been found to be an useful tool in studying the development of oocytes to maturity and spawning. An attempt to study the maturity by the measure ments of ova was first made by Clark (1934) on the California sardine (Sardina caerulea

Molecular biological techniques in disease diagnosis - Winter school on recent advances in diagnosis and management of diseases in mariculture, 7th to 27th November 2002, Course Manual

Rapid diagnosis of diseases is indispensable in aquaculture management for control of diseases and for developing appropriate strategies in health management of cultured stock. Lack of knowledge about diseases and their reasons as well as absence of tools to accurately diagnose diseases often lead to indiscriminate use of chemicals and antibiotics in culture systems. This results not only in environmental pollution but also pave the way for the development of disease resistant pathogenic organisms (Karunasagar and Karunasagar, 1998)

Survival of trawl-caught fish in experimental fishing in the Gulf of Mannar and Palk Bay off southeast coast of India

Survival of injured fish caught in a series of experimental trawl hauls conducted in the Gulf of Mannar and Palk Bay (8°55’ – 9°20’N; 79° - 79°40’E) in the southeast coast of India has been examined. Larger size groups of trawl-caught finfish survived longer, while inedible organisms showed shorter duration of survival. Among the target groups, the blue crab, Portunus pelagicus had the greatest survival ratio. Among the non-target groups, molluscs and stomatopods survived better than others. Generally, inedible taxa were relatively more resilient to trawling pressures, showing better survival and reduced injury

Gene cloning - techniques and strategies

Genetic information is coded in DNA found in the nucleus and mitochondria of animal cells and chloroplast of plant cells. The flow of genetic information from DNA to RNA and subsequently to polypeptides or proteins forms the central dogma of molecular biology. From the complex pool of DNA how can one isolate and study a specific sequence, or in other words, a gene of interest? The technology of gene cloning allows the amplification and recovery of a specific fragment from the highly complex DNA pool so that it can ,be comprehensively studied with regard to its structure, function, regulation, expression, et

Environmental DNA (eDNA) metabarcoding-based estimation of marine stocks

Information on species composition and biomass/abundance of exploited species in coastal fisheries is vital in management of resources. One of the most important mandates of the leading institution is judicious management of coastal and deep sea fishery resources. Traditional methods of identifying species and estimating biomass/abundance have inherent drawbacks which could be ameliorated by DNA marker based approach. Environmental DNA (eDNA) can be obtained from the skin, mucous, gamates, faeces, blood and other cells that are constantly being shed into the immediate environment by the organism. Analysis of this eDNA can give us information on the organisms, their abundance and biomass. Recent advances in next generation sequencing enable simultaneous sequencing of DNA from whole communities known as metabarcoding. Studies carried out in aquaria, large lakes, rivers and marine environment consistently suggest that eDNA metabarcoding outperforms traditional survey methods in terms of non-invasive sampling, sensitivity and cost incurred

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