International Journal of Marine Science, 2017, Vol.7, No.41, 394-398
397
cages and fixed cages for
Penaeus indicus
. Environmental conditions were more favorable for shrimp farming and
were consistent with many studies. Ahmed (2010) refers to temperature (°C) 29-30, pH 8.3-8.6, dissolved oxygen
(mg/l) 4.5-5.1 and high salinity (mg/l) during rearing of prawn
Macrobrachium rosenbergii
in cages.
Maheswarudu et al
.
(2016) showed that the temperature ranged between 26-32, dissolved oxygen between 3.9 to
4.5 and pH between 8.1 to 8.3.
Although there has been a good increase in the amount of shrimp cultivated in cages, the increase in weight may
be higher due to several factors, such as the inability of shrimp to benefit from benthic nutrition, the use of a diet
with a protein content not exceeding 30%, shortening the duration of the culture, and other shrimp larvae go to
breeding ponds, especially larvae and sprigs of shrimp, which led to competition for food, as well as there may be
another reason that affects the growth of shrimp, but due to environmental factors, including the absence of fans to
flop water for the work of waves and currents of continuous water favored farmed shrimp, especially that cages
placed in the basins originally static.
Ghosh et al
.
(2016) had a feeding ratio of one to four times daily, feeding and harvesting after 68 days, prawns
L.
vannamei
were grown at a weight of 0.86 g and with a density of 1060 m² in Floating Cages, monoculture and
mixed farming, the final weight was 13.3-13.5 g, 64.7 to 76.8% and feed conversion rates between 2-1.6 and 0.18
to 0.19 g respectively, referring to temperature (°C) 29-30, pH 7.4-8.2, dissolved oxygen (mg/l) 3.6-4.2 and
salinity (mg/l) 17-28.
From Figure 1, weekly weights of shrimp cultured in submersible cages and floating cages were observed that
weights at submersible cages were the best in 45 days, although there were no significant differences between
them. This is a good indicator of freshwater cage culture in freshwater and these studies suggest that the quality of
pond water, particularly lake basins, should be maintained to obtain an increase in production of submersible cage
culture which is more successful for raising shrimp with other habitats and benefiting from fish ponds in shrimp
culture with submersible cages and obtaining high production and multiple, while floating cages are the best in
running water, especially deep water at sea coasts.
Authors’ contributions
I have done all the research requirements and become this final form.
Acknowledgments
I would like to thanks and appreciation to the Center for Marine Sciences, Basrah University, Iraq and especially those working in the
clay ponds for support and protection.
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