Diel fluctuation of soluble phosphorus in the tank water of rainbow trout, Oncorhynchus mykiss (Walbaum), and relationships with feed inputs and dissolved oxygen

Rainbow trout is a new fish farming object for Uzbekistan, the adaptability of which (first of all, growth) to local conditions should be carefully studied. We analyzed the growth of rainbow trout in the conditions of flowing pools and cages in the foothill zone of Tashkent province of Uzbekistan. From March to October, the water temperature in the Khojikent reservoir varied from 4.9 to 13.1 °C, the amount of dissolved oxygen was 8.4 to 11.5 mg/l, and the pH was 7.40 to 7.67. In the flowing basin, the temperature was 15-18 °C, pH 7.2-7.5, the amount of dissolved oxygen 6.1-11.2 mg/l. The conditions of the foothill zones of Uzbekistan in terms of water quality are favorable for the development of trout breeding. During the season, fish in cages increased from 250 g to 623 g, in pools from 25 g to 390 g on average. The waste was 1.7%. The actual fish productivity of the basin is 39 kg/m3, the cage is 30 kg/m3 and the feed coefficient in the basin is 1.2, in the cages - 1.09.

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The effects of swimming exercise and dissolved oxygen on growth performance, fin condition and survival of rainbow trout Oncorhynchus mykiss

Aquaculture Research ◽

10.1111/are.14600 ◽

2020 ◽

Vol 51 (6) ◽

pp. 2582-2589

Author(s):

Thomas Waldrop ◽

Steven Summerfelt ◽

Patricia Mazik ◽

P. Brett Kenney ◽

Christopher Good

Keyword(s):

Rainbow Trout ◽

Dissolved Oxygen ◽

Oncorhynchus Mykiss ◽

Growth Performance ◽

Swimming Exercise ◽

Rainbow Trout Oncorhynchus Mykiss

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Growth of rainbow trout (Oncorhynchus mykiss) in warm-temperate lakes: implications for environmental change

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2012-0409 ◽

2013 ◽

Vol 70 (5) ◽

pp. 815-823 ◽

Cited By ~ 9

Author(s):

Jennifer M. Blair ◽

Ilia Ostrovsky ◽

Brendan J. Hicks ◽

Robert J. Pitkethley ◽

Paul Scholes

Keyword(s):

Rainbow Trout ◽

Dissolved Oxygen ◽

Oncorhynchus Mykiss ◽

Growth Rates ◽

Anthropogenic Impacts ◽

Temperate Lakes ◽

Lake Productivity ◽

Eutrophic Lakes ◽

Rainbow Trout Oncorhynchus Mykiss ◽

Warm Temperate

To predict potential effects of climate and anthropogenic impacts on fish growth, we compared growth rates of rainbow trout (Oncorhynchus mykiss) in nine closely located warm-temperate lakes of contrasting morphometry, stratification and mixing regime, and trophic state. Analyses of long-term mark–recapture data showed that in deep oligotrophic and mesotrophic lakes, trout growth rates increased with increasing indices of lake productivity. In contrast, in shallow eutrophic lakes, where fish habitat volume is constrained by temperature and dissolved oxygen, trout growth rates declined with increasing productivity. Growth rates were higher in lakes with greater volumes of favourable habitat (i.e., dissolved oxygen > 6.0 mg·L−1 and temperature < 21 °C) and lower in lakes with increased turbidity, chlorophyll a, and nitrogen concentrations. Our findings suggest that increases in lake productivity and temperatures as a result of global climatic change are likely to be more detrimental to salmonid habitat quality in shallower, productive lakes, while salmonids will better endure such changes in deeper, oligotrophic lakes. Fishery managers can use this information to aid future stocking decisions for salmonid fisheries in warm-temperate climates.

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