High density rearing of rohu, Labeo rohita (Hamilton) from spawn to fry in concrete tanks: effect of daily feed ration and soil base on fry growth and survival. (14th July 2015)

• Record Type: Journal Article
• Authors: Das, Pratap Chandra; Jena, Joykrushna; Patro, Babita; Mahanta, Dipti
• Is Part Of: Aquaculture research. Volume 47:Number 12(2016)
• Page Start: 3973
• Page End: 3979
• Publication Date: 2015-07-14
• Subjects: concrete nursery -- rohu -- daily feed -- soil base -- growth -- survival; Aquaculture -- Periodicals; Fishery management -- Periodicals; 639.8
• DOI: 10.1111/are.12847
• Languages: English
• ISSNs: 1355-557X

Abstract

Abstract: Rearing of rohu spawn to fry size was carried out at high density (2000 spawn m −2 ) in large concrete nursery tanks (10 m × 5 m × 1.2 m) to standardize the daily ration of supplementary feed and to assess the impact of soil base on the fry performance. In Set‐1, supplementary feed was provided at 100% (control), 75% and 50% of the daily ration that is commonly used in earthen carp nursery ponds and named as the three treatments T‐1, T‐2 and T‐3 respectively. Although in Set‐II, performance of fry were evaluated in tanks provided with and without soil base. The fry survival was to the tune of 45–59% at this high density of 2000 spawn m −2, indicating the efficacy of the concrete nursery system for high density seed rearing. In Set‐I, T‐2 receiving 75% of the control ration exhibited similar fry growth as that of T‐1, but its fry survival (58.8%) was 10% higher than the latter. This indicated that supplementary feed in a concrete nursery can be reduced up to 25% of that provided in earthen nursery system while ensuring a higher fry yield. However, further reduction up to 50% of the control ration in T‐3 yielded lower fry survival and growth ( P < 0.05) revealing inadequacy of the available feed. In Set‐II, treatment without soil base (T‐ns) yielded similar fry growth but 10% higher survival compared to that with the soil base (T‐s) revealing non‐essentiality of soil base in concrete tanks for such short‐term nursery rearing of rohu.