मंडपम क्षेत्र में फीतामीन मात्स्यिकी का पुनर्जागरण

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Trends, seasonality, cyclicity – A time series view point -Winter School on Impact of Climate Change on Indian Marine Fisheries held at CMFRI, Cochin 18.1.2008 to 7.2.2008

Analysis of climatic data unwaveringly involves two factors of tagging viz space and time. If our focus is on the upheavals in these factors in the long run temporally distributed data is the basic requirement. These types of observations on one ore more variables that occur in a time sequence are called as time series (TS). Mostly these observations are collected at equally spaced, discrete time intervals. One of the enduring assumptions pertaining to the time series is that some aspects of the past pattern will continue to remain in the future. Also in this setup the past values of the main variable almost fully explains the realizations unlike typical regression setups wherein exclusive explanatory variables would have been drafted

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

समुद्री स्तनियों की आणिवक वर्गिकी

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Estimation of mortality

Estimation of mortalit

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