Effect of Hatching Time on Larval Mortality and Survival of the Prawn Macrobrachium idae

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Pandian, T. J. and Katre, S. (1972) Effect of Hatching Time on Larval Mortality and Survival of the Prawn Macrobrachium idae. Marine Biology, 13 (4). pp. 330-337. ISSN 1432-1793

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Official URL: https://doi.org/10.1007/BF00348081

Abstract

The prawn Macrobrachium idae Heller carries 40 to 160 eggs depending upon the body size of the mother animal. After incubation, 63, 35 and 2% eggs are hatched on the first, second and third hatching nights, respectively. Mean dry weight of a single larva relased on the first night is 420 μg (equivalent to 2.86 cal). Larvae released on the second or third hatching nights weighed 380 μg (=2.56 cal) or 308 μg (=2.02 cal). The total reserve yolk-energy available in a larva hatched on the first night is 1 cal. There is a definite shift from protein to fat metabolism as hatching is delayed. Oxygen consumption of developing eggs awaiting release on the first or second hatching night is 1.9 μl/mg dry weight/h. In comparison to larvae released on the first night, those released on the second night exhibit 2% increase in total body-length and 2.4 or 14.3% decrease in the lengths of the 6th abdominal segment or the orbit. Larvae released on the first, second or third hatching nights, on exposure to starvation stress, survive for 3.8, 2.3 or 1.5 days. The swimming speed of larvae released on the first or second night is 1.0 or 0.6 cm/sec. Larvae released on the subsequent hatching nights committed nearly 2 times greater number of mistakes per cm distance in the horizontal plane. Since hatching of all developing eggs simultaneously on the first hatching night is possible by means of artificial technique(s), it is possible to “improve” survival rate of decapod larvae.

Item Type: Article
Subjects: Faculty of Science > Environmental and Biological Sciences > Zoology
Divisions: Jnana Bharathi / Central College Campus > Department of Zoology
Depositing User: Mrs Sushma H R
Date Deposited: 10 May 2016 09:55
Last Modified: 10 May 2016 10:01
URI: http://eprints-bangaloreuniversity.in/id/eprint/3397

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