630 research outputs found
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
On the first Mud Crab fattening farm in Dakshina Kannada, Karnataka
Culture practices along the Karnataka coastal zone are restricted to only shrimp farming. Apart from shrimp, the potential candidate species suitable for farming along this part of the coastal area is the mud crab Scylla tranquebarica
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
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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┬вcantly
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
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