तारली और मलबार सोल के स्टाँक पर बारिश का प्रभाव

कृपया पूरा लेखा पढ

Blue whale washed ashore at Kuttayi Landing Centre, Malappuram, Kerala

On 27th February 2010, a blue whale, Balaenoptera musculus, measuring 31 feet in total length was washed ashore at Kuttayi Landing Centre in Malappuram District of Kerala

The bane of juvenile fish catches

Juvenile fishes are defined as immature fishes that have not yet had the opportunity to replenish the fish population by spawning. The length at which 50% of the fishes of any particular species mature varies among species and is called its Length at First Maturity (Lm). When juveniles are caught in large numbers there is an economic loss as fishermen get very low prices for the small sized young fish as compared to the larger adults

Record sized Alepes vari and Nematalosa nasus

The herring scad, Alepes vari is a common pelagic fish species in the family carangidae. The species is the largest fish of the scad genus Alepes and maximum length so far recorded all over the world oceans is 560 mm TL (Froese & Pauly, FishBase 2016, http://www.fishbase.org.). During a regular field visit, an unusually large specimen of A. vari was recorded from Kalamukku Landing Centre, Kerala on 25th May, 2016. This was a male individual measuring 600 mm in total length (TL) and weighing 1.6 kg (Fig. 1)and was caught by hook and line. Young ones occasionally occur in pelagic trawls and larger ones rarely occur in gill net and hook and line catches

किशोर मछली पकड़ का अभिशाप (The bane of juvenile fish catches)

Juvenile fishes are defined as immature fishes that have not yet had the opportunity to replenish the fish population by spawning. The length at which 50% of the fishes of any particular species mature varies among species and is called its Length at First Maturity (Lm). When juveniles are caught in large numbers there is an economic loss as fishermen get very low prices for the small sized young fish as compared to the larger adults

Ribbonfishes

The ribbonfishes, also known as hair-tail or cutlass, form a major and abundant fishery resource among the marine pelagic finfishes of the Indian seas. They belong to the family Trichiuridae and are characterised by elongate, compressed and ribbon-like body; prominent canine-like teeth; lack of caudal fin and the silvery colouration. They are essentially marine, but occur in the estuaries too. They have a distribution in the Atlantic and Indo-Pacific regions and in India they are distributed all along the coast with abundance in the northwest and central east coasts. In India, three decades ago, they were low priced fishes and hence were preferred by the poor. Large fishes were consumed fresh and transported even to the interior markets, but the smaller ones, in excess of the local requirements, were usually sun-dried on the beach. Later the marketing scenario of ribbonfishes underwent a drastic change when it gained a position in the export market. Currently large quantities of ribbonfishes are exported in the frozen form to China, Japan and other southeast Asian countries. During the year 1999- 2000 (April-March), frozen ribbonfishes contributed up to 18% to the total marine products export of India and among the exported frozen finfish products its share was 48%. In the subsequent year (2000-01) its contribution almost doubled forming 30% and 63% respectively

Ring seine fishery of Kerala: An overview

Among the various fishing gears employed for pelagic schooling fishes along the Kerala coast, seines are the most efficient. Contribution of ring seine to total marine fish landings of Kerala has steadily increased since its introduction during the early eighties. It was 21.4 % in the nineties rising to 36.7 % during the period 2000-2004 and contributing more than 50 % since then. In recent years, about 90 % of the oil sardine and about 60 % of the mackerel landed in Kerala were caught in ring seines. Ring seines were introduced during the early eighties by traditional fishers of Alappuzha District which became highly successful

Sphyraena arabiansis a new species of barracuda (Family: Sphyraenidae) from the south-west coast of India

A new species of barracuda Sphyraena arabiansis is described based on specimens collected from the eastern Arabian Sea off Kerala coast, India. The new species is morphologically similar to Sphyraena barracuda and both were so far considered as one species. Characters such as more and relatively small cycloid scales, 118-122 along lateral line, 11 along vertical axis above lateral line at first dorsal and 13 below the lateral line at anal origin; broad, round spoon shaped maxilla ending vertically below, before the anterior margin of the eye, narrow inter orbital area (4.2-5.13 in head length) and more prominent pointed paired central lobes of caudal fin make Sphyraena arabiansis sp. nov. clearly distinct from S. barracuda. Other distinguishing characters are prominent curve of the lateral line before the origin of first dorsal fin, absence of black spots on the body, white branchiostegal membrane, broad, thick and inwardly curved otoliths with round, blunt posterior end and an elongated, pointed anterior upper lobe. The mitochondrial Cytochrome oxidase C subunit 1 (COI) gene sequence studies revealed that the new species has distinct genetic divergence from S. barracuda and other species of the family occurring in the area

Length-weight relationship of Johnieops sina (Cuvier, 1830) off Cochin, south-west coast of India

Length-weight relationship of Johnieops sina was estimated from 392 males and 487 females in the length range of 102-208 mm (TL), collected from fish landings at Cochin and Munambam fisheries harbours as well as Vypin fish landing centre in Kerala, on the south-west coast of India during the period from January 2008 to June 2010. The length-weight relationship equations were derived as W= 0.000074956 L 2.6260 for males and W = 0.0000426 L 2.7393 for females. Analysis of covariance showed that there is no significant difference between sexes (p>0.05). Hence, common length-weight relationship using pooled data of the two sexes was derived as W=0.00005854 L 2.6753. Results of the Student’s t-test indicated significant deviation of ‘b’ from ‘3,’ tending towards negative allometric growth (p<.0.05)

Food and feeding habits of Johnieops sina (Cuvier, 1830) along Cochin coast of India

Food and feeding habits of Johnieops sina were studied along the Cochin coast during the period 2008-2010. Johnieops sina mainly feed on crustaceans followed by teleost fishes and the juveniles mainly feed on Acetes. Highest percentage of penaeid prawns and fishes was observed in 190-199 mm and 160-169 mm length groups, respectively. Incidence of empty stomach was high in all months. Intense feeding in male fishes was observed during April, September, October and November, whereas the females fed intensively during December and Januar