Random amplified polymorphic DNA (RAPD) fingerprinting resolves species ambiguity of domesticated clown fish (genus: Amphiprion, family: Pomacentridae) from India

Clown fishes of the genus Amphiprion are a valuable resource from the point of view of the aquarium trade. There are about 27 species distributed widely in the Indo West Pacific region, extending from the eastern Indian Ocean to the Indonesian and Philippine archipelagos and from the coast of northwestern Australia to the Ryukyu Islands of Japan (Allen 1980; Fautin & Allen 1992). Allen (1991) used morphological similarities to designate six taxonomic complexes of closely related species. Apart from colour variation, tooth shape, scalation on the head and body proportions are used to identify the species of clown fish (Fautin & Allen1992).The occurrence of multiple colour variants in most of the species, besides variations in colour patterns between juveniles and adults of the same species, makes unambiguous identification in clown fishes difficult

അലങ്കാര മത്സ്യം വളർത്തൽ (Ornamental fish keeping) Malayalam

അലങ്കാര മത്സ്യം വളർത്ത

Application of DNA fingerprinting in genome analysis of fishes

DNA-level markers find several applications in fisheries research analysis and aquaculture. Species identification, evaluation of phylogeny, delineation of stock structure, measuring levels of genetic variation in wild and cultured stocks, conservation genetics, determination of breeding strategies, gene mapping, marker - assisted selected and assessment of genome manipulation techniques are among various uses of DNA markers in studies of natural and cultured fish populations

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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Record landings of the catfish, Osteogeneious militaris (Linnaeus) at Rameswaram

Duringjanuary-April 1992, 368t of Catfishes were landed (CPUE 52.2 kg) at Rameswaram fished by Pair trawlers in the area 9°20' - 9°30'N latitude and 79° 20' -79°30'E longitude, west of Katchativeu, which is a record catch. Osteogeniosus militaris formed 62% (228t) of catfishes; such heavy landings of this species have never been reported earlier from this area

Population dynamics of big-eye croaker Pennahia macrophthalmus and blotched croaker Nibea maculata (Pisces/Perciformes/Sciaenidae) in the trawling grounds off Rameswaram island, east coast of India

In the region off Rameswaram (lat. 86 55'-9° 20'N; long. 79"-79° 40'E) sciaenids are exploited almost exclusively by trawlers, Of the 9 commonly occurring species of croakers. Pennahia macrophthalmus (Bleeker) in the Palk Bay and Nibea maculate (Schneider) in the Gulf of Mannar are the dominant one

Ornamental fish culture and trade: current status and prospects

Ornamental fishes are often called as 'living jewell; due to their colour, shape, behaviour and origin. They are peaceful, generally tiny available in attractive colours and capable ofliving in confmed spaces. In China aquarium fish keeping has been a hobby from ancient times

Some observations on the biology of the blotched Croaker Nibea maculata (schneider, 1801) from Mandapam

Some aspects of the biology of NQ>ea maculata from Mandapam waters are studied. Regression coefficients in the length-weight relationships of females and males of N. macutala show significant difference between them and both significantly differ from the cubic value. The spawning season is from April to August and the females appear to perform two spawning acts during this period. Relative condition factor is apparently related to the reproductive cycle. Females and males attain first maturity at 185 and 167 mm, respectively. Fecundity show wide fluctuations from 21,584 to 475,043 with high correlation to ovary weight. Overall sex-ratio shows predominance of females

मंडपम क्षेत्र में फीतामीन मात्स्यिकी का पुनर्जागरण

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