मछ्लीमार लक्षद्दीपवासियों के जीविकोपार्जन का आधार

कृपया पूरा लेख पढे

Economics of prawn culture in Vypeen, Kerala, with emphasis on some little-known facts

With the increasing demand for prawns in export market, extensive culture practices have given way to semi-intensive or intensive systems in many parts of the country. The perennial and most of the seasonal ponds of Vypeen Island near Kochi are still of extensive nature with little or no management. Although, some studies on economics of prawn farming in seasonal ponds are available (George, 1974, 1980; Purushan, 1987; Sathiadhas et al., 1989), such information on the perennial fields is almost lacking. Diseases, parasites, predators and competitors cause concern in culture systems (Shang, 1981). Yet, it seems to be ignored in economic analysis except on a very few occasions, as for instance by Mammen et al. (1980) and Beynon et al. (1981). The present paper, therefore, reports lhe economics of the perennial prawn culture fields in Vypeen pointing out what harm predation and disease cause in production. Some observations on the seasonal system are also made for comparison

Economics of Clam Exploitation from Backwaters at Azhicode - A Case Study

The exploitation of clams at Azhicode takes place throughout the year. At the onset of south west monsoon the flood water washes down the clam shells and accumulates them near the bar mouth from where they are immediately fished

Ornamental fish - prospects for culture

In 1978 work was initiated to culture the -blood clam Anadara granosa in the Bay. A 100 m2 area was selected, an elderly clam fisherman from the village was entrusted with the watch and ward. Wide publicity was given in the village to create awareness. In the evening, the site was fenced with dry palmyra leaves (to serve as pen enclosure). Nylon netting was not preferred due to possible poachin

Tuna livebaits

The fishery, biology and dynamics of livebaits used in the tuna pole and line fishery are discussed based on earlier and current work. Their catch in Minicoy showed interannual variation with an average of 7569 kg and CPUE of 2.5 kg. Clupeids dominated forming 39.5% followed by caesionids[32. l%).apogonids(22.5%} and pomacentrids(5.6%). At Agatti, the mean catch was 52 tonnes with a CPUE of 14 kg comprised exclusively of Spratelloides delicatulus. Biological characteristics such as size,food and feeding, sex-ratio,size at first maturity, spawning and fecundity, length-weight relationship etc of dominant species are given. Stock assessment studies on S. delicatulus and Archamia fucata indicated their over exploitation. Various measures for management and conservation of the resources along with future research priorities are indicated

मिनिकोय की जीवनशैली के कुच्छ पहलू

कृपया पूरा लेख पढे

On the landing of bowmouth guitar fish Rhina ancylostoma at Visakhapatnam Harbour.

A small mechanized trawler which operated at a depth of 60 to 90 m landed a guitarfish identified as Rhina ancylostoma (Class : Elasmobranchii, Order : Rajiformes, Family : Rhinobatidae) at Vishakhapatnam Harbour On 15 July 2004,. The specimen had the characteristic spiky thorns over the eyes and on the back and shoulders with numerous white spots dorsally on fins, body and tail. The specimen landed is probably immature. The morphometric measurements of the specimen are described in this paper

Status of exploitation of tunas at Agatti Island, Lakshadweep

i'ole and line fishing for tunas is a vital component of the fishery of Lakshadweep 'orming about 80% of the total tuna caught in these islands. The northern island of \gatti is the largest tuna fishing area contributing 35-40%. During the period from 1994 -'97, the annual average catch was 1,280 t with CPUE of 347 kg and CPUB catch f)er unit bait) of 22 kg. Fishing season conunences from late November and continues up to May with peak catches during December to March. Skipjack Katsuwonus pelamis) is the major sjjecies caught followed by Auxis thazard, Thunnus ilbacares and Euthynnus affinis. Fishing grounds near Agatti subscribed 54% of the ;atch followed by Perumal Par forming 43%. The size of K.pelamis caught ranged irom 20 to 76 cm with modes at 48 and 54 cm. Of late, the tuna fishery of Lakshadweep s almost stagnant but there is scope for its expansion. In addition to the recommenlations made by earlier workers to expand the fishery, there is an urgent need to >btain data on some major aspects like population dynamics, migratory behaviour, invironmental factors influencing the distribution of various tima species and their iggregation around logs, FADs and seamounts

Mangrove ecosystems of Minicoy Island, Lakshadweep

Mangroves play an Important role in coral reef ecosystems. The fringe and basin type mangrove forests act as depositional areas and are effective binders of sediments. This reduces the sediment loads in coastal waters. Trapping and stabilizing sediments is important for adjacent coral reefs because it prevents abrasion and burial of reefs during stormy conditions

Zooplankton abundance and distribution at Minicoy lagoon, Lakshadweep

The environmental parameters such as water temperature, salinity, cloud cover wind foree, rainfall and tide that influence the distribution and abundance of zooplankton at two sites in Minicoy lagoon were siudied from August 1994 to July 1995. The northern part of the lagoon with more live corals had better abundance of ooplankton when compared to the southern area, Zooplankton from different lagoon bottoms namely coralline, sandy and seagrass bed did not how significant variation between sites. Copepods, 8mphipods and decapod larvae were the dominant groups