14 research outputs found
Reproductive biology of Sciaenid fish, Johnieops osseus (Day), from the South Kanara coast
Though some informalion is available regarding the
breeding habits and early life histories of sciaenids'-s
detailed studies on reproductive biology are lacking.
The present paper deals with the reproductive biology
of Johtlieops osseus, the dominant species of the
sciaenids captured off South Kanara Coast
Ovary as an indicator of frequency of spawning in fishes
In majority of the marine fishes from tropical areas, maturation is a
continuous process resulting in the occurrence of mature fishes throughout
the year. In several Indian marine fishes, because of multiple spawning,
a truly spent fish is scarcely found and also difficult to identify. Instead,
partially spent fishes have been reported in a number of cases. As the
eggs contained in the ovary are progressively ripened and shed, the ovary
itself grows smaller, and to the naked eye, seems to reverse the stages by
which it attained fuji maturity. The ovaries of such fi shes, though superficially resemble the normal stages III to V, differ from them in macroscopic
appearance as well as microscopic structure to some extent. It
occurred to the authors that such partially spent ovaries of fishes yield
clues to the frequency or spawning in different species. In the present
paper, the occurrence and nature of such ovaries and their relation to the
frequency of spawning in two species of ribbon-fishes and a sciaenid have
been discussed with supporting evidence from data on other fishes
Albino of the marine cat fish, Tachysurus tenuispini(Day)
A specimen of the marine cat fish, Tachysurus tenuispinis exhibiting complete albinism caught in a trawl net operated at night at a depth of about 25 m was collected at the Malpe fish Ianding centre on 10-2-197
Length-weight relationship and condition factor of the Sciaenid fish, Johnieops osseus (Day)
Length-weight relationship of J. osseus indicated an allometric form of growth. Seasonal variations in the condition offish could not be attributed to any particular facto
Fishery and bionomics of sciaenids of South Kanara
Sciaenids, popularly known is jew
fish, croakers or drums are one of the
commercially important groups of
marine fishes of India. They rank very
high in abundance forming on an
average, 7,04 % of the tora-f{.p1arine fish
catch of the country (1974-76)
Not Available
Not AvailableSciaenids, popularly known is jew
fish, croakers or drums are one of the
commercially important groups of
marine fishes of India. They rank very
high in abundance forming on an
average, 7,04 % of the tora-f.p1arine fish
catch of the country (1974 -76).Not Availabl
Reproductive Biology of Sciaenid Fish, Johnieops osseus (Day), from the South Kanara Coast
19-24J. osseus spawns throughout the year, releasing 3 batches of eggs in a year. Size at first maturity is 12 cm and fecundity about 46000 eggs per individual fish. Females outnumber males in commercial catches, although the sex-ratio shows no significant deviation
Instance of unusual structure of a scale of the sciaenid fish, Johnieops osseus (Day, 1876)
During the course of observations on the growth checks in the scales of the sciaenid fish, Johzzieops ossezrs
(Day), one ctenoid scale which markedly differed in structure from all the other scales was encountered in a female specimen,
160 mm in length. The scale was taken from the seventh row below the lateral line in the middle region of the body
Not Available
Not AvailableLength-weight relationship of J. osseus indicated an allometric form of growth. Seasonal variations in the condition offish could not be attributed to any particular factorNot Availabl
Length-Weight Relationship and condition Factor of the Sciaenid Fish, Johnieops osseus (Day)
67-68Length-weight relationship of Johnieops osseus indicated an allometric form of growth. Seasonal variations in the condition of fish could not be attributed to any particular factor