Occurrence of Saurida isarankurai Shindo and Yamada 1972 from the west coast of India

A total of eight species of the genus Saurim, Val. 1849, viz. Saurida tumbil (Bloch, 1795), Saurida gracilis Quay and Gaimard, 1824; Saurida undosquamis (Richardson 1848). Sourido longimonus Norman. 1939; Saurida micropectoralis Shindo and Yamada 1972 Sourido wanieso Shindo and Yamada, 1972, Saurida isarankurai Shindo and Yamada. 1972 and Saurida pseudotumbil Dull and Vidya Sagar, 1981 are known to occur in the seas around India (Day 1877, Munro 1955, Norman 1935, Rao 1977, Dutt and Vidya Sagar 1981, Nanda and Ramamoorthi 1982, Fischer and Whitehead 1974, Waples 1983). Dull and Vidya Sagar (1981) reported S. isarankuurai from India on the basis of material from Visakhapatnam and Kakinada, but did not provide any description. Later Nanda and Ramamoorthi (1982) reported this species again as a new record from India on the basis of one specimen from Porto Novo. While studying the taxonomy and biology of lizardfishes from the wcst coast of lndia, we collected several specimens of S. isarankuura

Occurrence of Tachysurus dussumieri (Valenciennes) with incubating young ones off Mangalore

During the course of routine observations on the purse-seine landings at Mangalore, a catch of about 21t of catfish (Tachysnrus dussumieri) was noticed on March 1982. They were netted in a single haul by a purse seiner off the New Mangalore harbour at a depth of about 10 m. Earlier observations along the Mangalore coast show that this species spawns only once a year during the period from December to March with peak in February. The T. thalassinus releases the young ones from its mouth when they are smaller in size as compared to T. dussumieri which retains the young ones measuring upto 78 mm in their mouth. The species could hold in their oro-buccal cavities as high as 100 or even more developing eggs ensuring perhaps a high hatching and survival rate

Drift gill net fishery along Mangalore-Malpe coast

Drift gill net is the major gear used in Mangalore- Malpe area to catch large pelagic fishes. Though the catch by drift-gill net forms only 1% of the toala marine fish catch, the value of the quality fishes it lands exceeds the value of other gears. this gear plays a pivotal roal in the economy of indigenious fisheries sector. the article deals with operation details of drift gill net, catch composition of major fishes and economic status of fishes due to this drift gill net

केंद्रीय समुद्री मात्स्यिकी अनुसंधान संस्थान का मंगलूर अनुसंधान केंद्र

केंद्रीय समुद्री मात्स्यिकी अनुसंधान संस्थान का मंगलूर अनुसंधान केंद्

Fishery and bionomics of tunas at Mangalore

Karnataka waters, on the upper part of S.W. coast of India produce an average total of 786 tonnes of tuna annually (1972-'81) forming 0.7% of the state's marine fish catch and 5 % of the total tuna catch of India. Of late, the production rate of this resource in the state had gone upto an average of 1,729 tonnes per year (1979-81). This rapid progress was achieved by the introduction of modern fishing techniques such as purse seining, deployment of mechanised crafts for drift gill netting and synthetic materials for gears

Study on the biology of Johnieops voglerl (Sleeker) Of Bombay waters

Johnieops vogleri in Bombay waters attains an average size of 158 mm, 240 mm and 290 mm at the end of 1, 2 and 3 years as shown by the length-frequency method, and 164.4, 220.6 and 276.6 mm as indicated by the scales. The time of annulus formation in the scales was during May to September which coincides with low intensity of feeding, spawning activities of the fish and the prevailing monsoon. Juveniles prefer crustaceans and, as they grow, show the piscivorous tendency. Lower intensity of feeding is noticed during the spawning season. Fifty percent of the fish mature at 159 mm in length. The relative condition of the fish is correlated to the spawning activities. Fecundity varied from 26,028 to 581,298 eggs. The distribution of sexes observed during different months of the year is not significant except during October and November. Among 130-179 mm size groups, males preponderated, whereas females were more among 220-249 mm size groups

A record of an oozing Eleutheronema tetradactylum (Shaw) from Mangalore

An oozing female Eleutheronema tetradactylum (Shaw) caught in a gill net from the inshore waters off Mangalore is recorded, as mature specimens are known only from the creeks around Bombay. The number of the transparent ova ready for liberation is estitmated

Induction and evaluation of triploidy in edible oyster, Crassostrea madrasensis (Preston) - an approach to enhance bivalve aquaculture

Induced triploidy can be used for enhancing production of commercially valuable bivalve species. Triploid individuals, having an extra set of chromosomes (3n) typically exhibit reduced gametogenic activity leading to better growth since the energy used for reproduction is reallocated for somatic growth. In India, research on genetic manipulation of the edible oyster, Crassostrea madrasensis by triploidy inducement and assessment of triploid performance as a strategy to increase production has been underway since 1998. This article outlines the potential of using triploidy in bivalve culture for better returns

Growth of triploid oyster, Crassostrea madrasensis (Preston)

The performance of I and II meiotic triploids and control oysters (Crassostrea madrasensis) reared at Tuticorin Bay was compared to determine if the improvements in the growth of edible oysters were additive to faster growth in triploids. After a grow-out period of 12 months, both mean whole weights and shell heights were in order Imeiotic triploid4IImeiotic triploid control. Mean whole weights and shell height of diferent oyster lines were all signi¢cantly different (Po0.05). On an average, larger morphological traits indicated that growth improvements from triploids were additive, and throughout the study triploid oystersmaintained faster growth rate than their diploid siblings. Condition index and adductormuscle diameter of both triploids were higher than those of control

Studies on the fishery and biology of the lizardfish, Saurida spp. from the Karnataka coast

India possesses a long coastline of 7,517 kin bordering the Arabian Sea, Bay of Bengal and the oceanic islands of Lakshadweep and Andaman Nicobar. The continental shelf area between 0 and 200 m depth is estimated at about 0.5 million km2 and the total area of Exclusive Economic Zone (EEZ), as 2.02 million km2 . The fishery resources in these seas are rich, diverse and typical of tropical waters. The marine fishing activities prior to independence were, however, only at a subsistence level with a low quantum of production. Concerted efforts for the development of the marine fisheries of the country were initiated after the country became independent in 1947. Through the various programmes relating to ..introduction of mechanised fishing vessels, improvement of fiShing~lements, establishment of infrastructural facilities for preservation, processing, storage, transportation and for landing and berthing of crafts, and the development of an export trade - implemented during different national schemes, the marine fisheries of the country expanded rapidly, playing a major role in supplying protein food, earning foreign exchange and promoting coastal rural development. The marine fish production of the country consequent upon these developmental programmes, increased gradually from 0.534 million tonnes in 1951 to the present yield level of2.3 million tonnes, contributing to over 1.5% of the total income from agricultural sector and earning Rs. 1767 crores from the export trade of fish and fishery products