Abstract:
21 experiments were conducted on six species of microalga.e. Phaeodactylum
tricornutum was grown to 3.5x105 cell/ml in 438 h. Nannochloropsis
oculata 4xl05 cells/ml, in 336 h, Palova luther! 8xlo5 cell/ml in 607 h,
Isochrysis galbana 4.2?105ce?l/ml in 390 h, Tetraselmis tetrahe?e 5xl05 cell/
and Chaetoceros calcitrans llxlo5 cells/ml in 633 h.
14 experiments were conducted on larval culture in which seven were
fully successfull. Three experiments on Peru:teus merguiensis with survival
rate of 12.33 % , 13.07 % , 10.·aa % , two on Penaeus penicillatus with survival
rate of 10.30 % , 20.28 % , one experiment on Penaeus semisulcatus with
20 .21 % survival and one on Metapenaeus affinis with 19 .45 % survival.
Spawners survey were conducted on the coast of Korangi Creek. Penaeus
merguiensis was most abundant (608; 6303 % ), f• penicillatus was second (67
6.86 % ), Metapenaeus affinis, third ( 60; 6.15 % ) , and g. semisulcatus was
fourth (47; 4.81 % ), remaining species were not important for culture.
_..,,.----? Experiments were also conducted on various type of f'eed t. "A.rtemia nauplii, -- '7?
cooked egg microparticles, crumbled and pelleted feed, microparticulate and
microencapsulated diet. The results for feeding the larvae from these feed are
satisfactory. This field is highly technical and require lot of funding, instrumentation
and technical know-how. More research is required in this field.
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•
-Exp-eriments were also conducted on lunar periodicity on spawning and maturation of penaeid shrimps, and eye ablation for facilitating spawning.
These techniques ?ere helpfulJ,.,in increasing the spawning frequency and production
of via-Ole eggs in captivity.
During July, 1997 to July, 2000, 61 experiments were conducted on
microalgal culture, 37 on larval culture and about lOC field trips were undertaken
for spawners survey and collection. The aims and object of the present
project is to undertake research studies to facilitate in developing a shrimp
hatchery in Pakistan. In this connection follwing aspects were covered: availability
of spawners, food culture for larvae (microalgae, rtemia, micropc,rticulate
and microencapsulated feed), Lar-va I culture, eye ablation a.nd 1W12r periodicity
in spawning. We have achieved all the project objectives aatie fac t.or-.
ilyi and we a.re ready to start a pilot project on hatchery develonment
