Some Aspects Of The Breeding Biology Of Macrobrachium Rosenbergii (De Man) With Emphasis On Its Egg Incubation And Larval Rearing
Ovarian maturation, artificial incubation of eggs and larval rearing of M. rosenbergii ( De Man ) were studied . Female prawns were categorised into seven arbitrary develop mental states based on the morphology of the gonads namely immatured females, matured females, pre-mating moult females , n...
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| 格式: | Thesis |
| 语言: | English English |
| 出版: |
1985
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| 主题: | |
| 在线阅读: | http://psasir.upm.edu.my/id/eprint/11745/1/FPSS_1985_1_.pdf |
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| 总结: | Ovarian maturation, artificial incubation of eggs and larval
rearing of M. rosenbergii ( De Man ) were studied . Female prawns
were categorised into seven arbitrary develop mental states based
on the morphology of the gonads namely immatured females, matured
females, pre-mating moult females , newly spawned females, females
with orange colour eggs, females with grey colour eggs and post
hatching females .The morphology and histology of the ovary for
each developmental state was then studied . The mean oocyte size
in the immature state was 47.0 + 1.3 urn and the oocyte size
increased to a maximum o f 402.0 + 3.5 urn a t the pre-mating moult state . After oviposition , the oocyte size dimini shed to 49. 0+
1.4 urn and then progressively increased Two series o f
experiments were done to determine the optimum salinity and
stocking density for artificial incubation of M. rosenbergii eggs .
Newly laid eggs and 9 day old eggs were stocked at a density of
500/1 and incubated at 0 ppt , 6 ppt and 12 ppt salinity
respectively .The mean percentage of hatching after 18 days of
incubation for the newly fertilised eggs were 0% , 3% and 40% as
compared to 2 % , 23% a n d 65% for 9 day old eggs .In the stocking
density experiments , newly laid eggs were stocked at the rate of
1000/1 ,1 500/1 and 2000 / 1 at 1 2 ppt and their mean percentage of hatching were 37% , 33 % and 16% respectively. Comparative dietary
studies of larval culture were done using the closed recirculating
system and the modified green water system .The larval diets
tested were Diet 1 : microcapsules , Diet 2 : egg custard and
Artemia and Diet 3 : microcapsules and Artemia . Larvae fed
exclusively microcapsules did not survive beyond six days of
larval culture in both the systems .CONTOH There was no significant
different ( P> 0 . 05 ) in t he production of juveniles between the
two systems though higher production was obtained in the
green water system . The mean number of juveniles obtained by Diet
2 using the green water system was 5 . 0/1 . When Diet 3 was used and
larval culture was done using the green water system , the mean
number of juveniles obtained was 2 . 5 /1 . The product ion of
juveniles using Diet 2 was significantly higher ( P<0 . 05 ) than
that o f Diet 3 . |
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