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Duration of stunting impacts compensatory growth and carcass quality of farmed milkfish, Chanos chanos (Forsskal, 1775) under field conditions.

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Title Duration of stunting impacts compensatory growth and carcass quality of farmed milkfish, Chanos chanos (Forsskal, 1775) under field conditions.
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Creator Lingam SS, Sawant PB*, Chadha NK, Prasad KP, Muralidhar AP, Syamala K, Xavier KM
 
Subject stunting impacts , carcass quality, milkfish, Chanos chanos
 
Description Not Available
An 18-months feld trial was performed to explore the efect of duration of stunting on growth, digestive enzymes and carcass quality in Chanos chanos. Milkfsh fry (weight of 1.25±0.03g and length of 5.53±0.03cm) were stocked in earthen ponds of 0.02ha, in triplicate, for diferent duration of stunting, viz., 4 months (Treatment-1; T4), 8 months (Treatment-2; T8) and 12 months (Treatment-3; T12) and a normal seed (Control; C) separately. In the stunting phase, fsh were stocked at higher stocking density (0.2 million/ha) and fed de-oiled rice bran at sub-optimal level. Post-stunting or refeeding phase commenced immediately after completion of respective stunting duration and fsh were reared for the rest of the period to complete the total rearing period of 18 months. In post-stunting, fsh stocking density was adjusted to (5000 pieces/ha) and fed at an optimum level (3%). At the end of stunting phase, the study found a signifcant reduction in growth, survival, digestive enzymes activity, except protease in the T4 group, and carcass nutrients composition of stunted fsh. However, in the initial phase of post-stunting, T8 group exhibited an elevated specifc growth rate (5.00±0.092%/ day), body weight gain (80.82±1.28g), amylase (0.585±0.021 U/mg protein), protease (5.48±0.13
U/mg protein), and lipase activity (7.92±0.32 U/mg protein). All stunted fsh groups displayed a compensatory growth response in post-stunting, but a complete growth compensation was observed in T8 group, which resulted in better feed conversion ratio (3.03±0.04) feed efciency ratio (0.33±0.01), protein efciency ratio (1.91±0.03), survival (91.38±0.07%) and digestive enzyme activities. Similarly, at the end of post-stunting, carcass analysis revealed a complete restoration of nutrients in stunted fsh and signifcantly higher protein content in T8 group. Further, the study found lower meat and higher bone contents in normally reared fsh than the post-stunted fsh which revealed the carcass quality improvement in post-stunted fsh thus indicates superiority of the stunting process over normal rearing. Overall, the study suggests that stunting of milkfsh, for 8 months (T8), positively afects its growth, survival, digestive enzyme activities and carcass quality which in turn, shall help to overcome the contemporary challenges in milkfsh culture.
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Date 2022-06-17T06:13:50Z
2022-06-17T06:13:50Z
2019-11-11
 
Type Research Paper
 
Identifier Not Available
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http://krishi.icar.gov.in/jspui/handle/123456789/72778
 
Language English
 
Relation Not Available;
 
Publisher Research Gate