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Maturity, spawning and fecundity of the king seer, Scomberomorus commerson (Lacepede), in the seas Around the Indian peninsula

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Title Maturity, spawning and fecundity of the king seer,
Scomberomorus commerson (Lacepede), in the seas
Around the Indian peninsula
Not Available
 
Creator Devaraj,M
 
Subject Maturity
spawning
fecundity
king seer
Scomberomorus commerson
Lacepede
 
Description Not Available
Based on tlie modes of ova, 12 progressive stages are identified in the maturation
of ovaries of king seer. A line, 3 standard errors above the regression of
Gonad Index on total length of fish in resting or immatures stages, L (G.I. =
—0.195 + 0.002046 L), is found useful in the separation of spawning flsh from
nonspawning fish. Estimation of maturity on the basis of the regression of maximum
ova diameter (m.o.d.) on G.t. holds only up to a G.I. of 7.2, beyond which
m.o.d. is in the range of 34 to 47 m.d. (1 m.d. = 0.0167 mm) irrespective of G.I.
The length at first maturity (701-800 mm or the median 750 mm) shows considerable
agreement with the values reported for the Papua New Guinea and
East African regions. Spawning season extends from January to September, during
which a weak brood results in January-February, a strong brood during the peak
spawning in April-May and another weak brood in July-August. The three batches
of ova in the spawn-ripe ovaries (stage L) are spawned successively at an interval
of a month or even less. The number of ova in the first, second and third batches
are in the ratio of 1 : 1 : 0.27. Spawning grounds are located along strictly inshore
and protected coves, as those close to Panaikulam on Palk Bay and Pudumadam
on the Gulf of Mannar. Males, females and indeterminates are in the
ratio 52.3 : 43.2 : 4.5. Males are dominant up to a length of 1300 mm, and
females, beyond this length. There is no significant difference in the fecundity between
different maturity stages (F to L) or between estimates by different formulae.
The relation between absolute fecundity, defined as the total number of ova
spawned in one season over the three spawning acts (y in thousands), and total
length of fish (x in mm) is found to be, y = -2273 + 3.5793 x. Fecundity-fish
weight relation reveals that, for every ton of spawning females, 291.9 million eggs
are produced. For most of the maturity stages, egg size-fish length relation exhibits
negative correlation.
Not Available
 
Date 2021-08-13T04:20:05Z
2021-08-13T04:20:05Z
1983
 
Type Article
 
Identifier Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/56014
 
Language English
 
Relation Not Available
 
Publisher CMFRI/ICAR