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Effects of estuarine oyster, Crassostrea cuttackensis as the extractive species at varied densities on productivity and culture environment in brackishwater integrated multi-trophic aquaculture (BIMTA) system

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Title Effects of estuarine oyster, Crassostrea cuttackensis as the extractive species at varied densities on productivity and culture environment in brackishwater integrated multi-trophic aquaculture (BIMTA) system
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Creator Naskar, S., Biswas, G., Kumar, P., De, D., Sawant, P. B., Das, S., & Roy, U.
 
Subject BIMTA, Extractive species, Crassostrea cuttackensis, Chanos chanos, Penaeus vannamei, IMTA
 
Description Integrated multi-trophic aquaculture (IMTA) involves incorporation of species from different trophic or nutritional
levels in the same system to get better production based on mutual gain to the co-cultured species and
improved ecosystem health. However, in brackishwater, very few trials on IMTA have been conducted so far with
scarce information on the optimum density of extractive species like oyster and seaweed. Edible estuarine oyster,
Crassostrea cuttackensis is abundantly available in the Sundarban. Being a filter-feeder, it can be used as an
extractive species for organic matter removal in IMTA. Therefore, an experimental trial was conducted to assess
the effect of different stocking densities of C. cuttackensis on performances of milkfish (Chanos chanos) and Pacific
white-leg shrimp (Penaeus vannamei), and environmental remediation in an IMTA system. There were three
densities of oyster, 0.6 (T1), 1.2 (T2), and 1.8 (T3) kg m􀀀 3 distributed to 1000 L FRP circular tanks containing
milkfish (4.51 ± 0.05 g) and white-leg shrimp (4.50 ± 0.03 g) at 25 and 50 no. m􀀀 3, respectively. Control tanks
contained the same number of milkfish and shrimp with no oyster. All the three treatments and control had
triplicate tanks. During the 60-day trial period, fish and shrimp were fed with a common diet containing 30%
crude protein at 5% of biomass. Results showed that the highest growth of milkfish (24.66 ± 0.31 g) and shrimp
(15.20 ± 0.17 g) was obtained in T3 (P < 0.05) compared to that of the control [13.97 ± 0.08 g (milkfish), 11.83
± 0.13 g (shrimp)]. Apparent feed conversion ratio (AFCR) was the lowest in T3 (0.92 ± 0.01) (P < 0.05).
Although, survival of milkfish did not vary, shrimp survival was the highest in T3. The inorganic nutrients
(nitrogenous and phosphorus compounds) and particulate organic matter (POM) of water improved in all the
IMTA treatments compared to the control. The number of total heterotrophic bacteria and Vibrio counts in tank
water was significantly low in T3 (P < 0.05). The benefit-cost ratio in T3 was found to be 1.6 times higher than
that of the control. This trial suggested that oyster, C. cuttackensis can act as an effective extractive species in
IMTA system when stocked at a density of 1.8 kg m􀀀 3. Therefore, treatment T3 IMTA model proved to be more
productive and had a successful bio-remediation effect on the environment.
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Date 2023-02-01T15:06:40Z
2023-02-01T15:06:40Z
2022-03-05
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/75921
 
Language English
 
Relation Not Available;
 
Publisher Elsevier