International Journal of Marine Science, 2017, Vol.7, No.41, 394-398
396
Table 2 Growth performance of
M. affinis
in submersible cages (SC) and floating cages (FC) for 45 days (mean ±standard deviation)
Parameters
FC
SC
Mean initial body weight (g)
2.383 ± 0.400
2.350 ± 0.636
Mean final body weight (g)
3.275 ± 0.389
4.230 ± 0.806
Total weight gain (%)
0.884 ± 0.011
1.880 ± 0.170
Mean daily growth rate (g/day)
0.020 ± 0.001
0.042 ± 0.004
Feed conversion rate (FCR)
2.476 ± 0.487
1.462 ± 0.350
Relative growth rate (%)
38.008 ± 6.858
82.031 ± 14.993
Shrimp survival (%)
76 ± 5.659
92 ± 5.657
Figure 1 Breeding of shrimp
M. affinis
in submersible cages (SC) and floating cages (FC), fed on diet for six weeks
3 Discussion
Cage culture are a reliable method of pool representation and are more economical and are more representative of
the environmental conditions of the laboratory and are a compromise for shrimp research applications (Castex et
al., 2008).
In present study, it showed feed conversion rate, weight increase, daily growth and relative growth when shrimp
culture in submerged cages gave or were better than in shrimp culture at floating cages, due to the following
reasons. At the bottom through the pores and capture lack of loss of food given to the shrimp during the
submersible cages while getting in a part of the food in the shrimp in the floating cages through the descent of part
to the bottom one way or another, because of the nature of the living shrimp and the border with the bottom and
lack of movement by immersing his body in the bottom during the submersible cages compared with floating
cages, which consume large energy through the large movement to maintain its balance and adaptation. And the
results of the present study have high survival rates.
And they are consistent with several studies, including. Cuvin-Ararlar et al
.
(2009) which mentioned that the daily
growth rates range between 0.11-0.24 g/day and feed conversion rate range 1.53-165 in cage culture of
Litopenaeus vannanei.
While Maheswarudu et al
.
(2016) showed that the rate of culture 1179 per m³and the
number of feeding times variable, FCR was 3.9, and the weight increases from 0.030 to 0.590 g and the survival
rate 88.9% farmed of shrimp
P. monodon
in floating cages during 45 days. Siddharaju and Menon (1982)
observed in the lower survival rate of 97%, but in the higher stocking density of 20/m²for the culture of
P.
monodon
in the cages. In the present study the survival rate recorded in SC was better than FC of previous works.
Krishnan et al
.
(1983) observed the survival rates of 56-59% in the higher stocking density of 25/m² in floating
