Growth Performance and Egg Ratio of a Marine Rotifer Brachionus rotundiformis Fed Different Diets in Captivity
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Growth Performance and Egg Ratio of a Marine Rotifer Brachionus rotundiformis Fed Different Diets in Captivity Jewel Das 1 & Md. Sohrab Hossain 1 & Jakia Hasan 2 & Mohammad Abdul Momin Siddique 3,4 Received: 17 June 2020 / Revised: 20 August 2020 / Accepted: 14 September 2020 # Springer Nature Switzerland AG 2020
Abstract This study was carried out to evaluate the population growth and egg ratio of Brachionus rotundiformis by feeding with three different diets, i.e., live microalgae Nannochloropsis sp., Baker’s yeast, and powdered spirulina. A total of nine conical flasks of 1 L volume were divided into three treatment groups for determining the feeding performance for eight consecutive days. Each experimental group was stocked with B. rotundiformis at an initial density of 10 ind. mL−1. Water temperature, pH, salinity, and light were maintained at (24–29) °C, (7.5–8.5), 30 ppt, and 4000 lx, respectively. Feed was provided twice per day at 9:00 AM and 7:00 PM. The highest mean (±SE) population growth of rotifer was achieved at the end of the culture period (on the 8th day) fed live Nannochloropsis sp. (122 ± 12 ind. mL−1), which was significantly higher compared to the Baker’s yeast and powdered spirulina (p < 0.05). The mean egg ratio of B. rotundiformis fed three diets was significantly differ at different rearing periods (p > 0.05). The highest mean (±SE) egg ratio of B. rotundiformis was observed in the live Nannochloropsis fed group (0.89 ± 0.01) at the end of the rearing period, which was significantly higher than that of Baker’s Yeast and powdered Spirulina fed group (p < 0.05). Among the three diets, live Nannochloropsis had shown the dietary superiority over Baker’s yeast and powdered spirulina in culturing B. rotundiformis. The results of this study suggest that live Nannochloropsis could be the most suitable diet for the laboratory culture of B. rotundiformis. Keywords Reproduction of rotifer . Laboratory culture . Egg-bearing rotifer
Introduction Global fish production accounted for 171 million tonnes, which was represented 47% of the total production estimated at USD 232 billion in 2016 (FAO 2018). A robust growing trend of global fish production from aquaculture demands a
* Mohammad Abdul Momin Siddique [email protected]; [email protected] 1
Institute of Marine Sciences, University of Chittagong, Chittagong 4331, Bangladesh
2
Bangladesh Fisheries Research Institute, Marine Fisheries and Technology Station, Cox’s Bazar 4700, Bangladesh
3
Department of Oceanography, Noakhali Science and Technology University, Noakhali 3814, Bangladesh
4
Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, University of South Bohemia in Ceske Budejovice, Zatisi 728/II, 389 25 Vodnany, Czech Republic
smooth supply of inputs in terms of seed, feed, and other essentials (Tacon et al. 2011). The precedent decades experienced a dramatic expansion of freshwater and marine aquacultu
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