This study was performed to evaluate the effect of temperature on the carbon(C),nitrogen(N),and phosphorus(P)nu-trient budgets of adult steelhead trout(Oncorhynchus mykiss)with different body sizes.A complete two-factor experiment was con-ducted at four temperatures,i.e.,9℃(T9),13℃(T13),16℃(T16),and 19℃(T19);and three body sizes,i.e.,0.65kg±0.02kg(S1),1.22 kg±0.06 kg(S2),and 2.05 kg±0.09 kg(S3).The following properties of steelhead trout were determined:C,N,and P nutrient budgets;feed intake rate;fecal production rate;oxygen consumption rate;ammonia excretion rate;phosphorus excretion rate;scope of the growth of C,N,and P;and absorption efficiency of C,N,and P.Results showed no significant interaction between temperature and body size in terms of the nutrient budgets of steelhead trout.However,temperature and body size played important separate roles in the nutrient budgets except for the absorption efficiency of nitrogen.The feed intake rate,fecal production rate,ammonia excretion rate,phosphorus excretion rate,and scope of the growth of C,N,and P were the highest in the T16 treatments.The absorption effi-ciency of C and P decreased as temperature increased.Nonlinear multiple regression results indicated that 15℃was the approximate optimal temperature for the feeding and growth of steelhead trout.The feed intake rate,fecal production rate,oxygen consumption rate,ammonia excretion rate,phosphorus excretion rate,and scope of the growth of C,N,and P per unit of the body weight of fish decreased as body size increased.The absorption efficiency of C increased as body weight increased,and the absorption efficiencies of P in the S2 and S3 treatments were significantly higher than those in the S1 treatment.During the culture of steelhead trout,the daily ratio should be adjusted with changes in the temperature and body size of fish.Furthermore,managers should focus on the risk of hypoxia at high water temperatures.

ZHANG Gong;GAO Qinfeng;ZHOU Yangen;DONG Shuanglin;WANG Meijun;GAO Yonggang

Key Laboratory of Mariculture,Ministry of Education,Ocean University of China,Qingdao 266003,China;Function Laboratory for Marine Fisheries Science and Food Production Processes,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266100,China;Fishery Technology Promotion Station of Rongcheng City,Weihai 264300,China

中国海洋大学学报（自然科学英文版）

[1]ZHANG Gong;GAO Qinfeng;ZHOU Yangen;DONG Shuanglin;WANG Meijun;GAO Yonggang-.Effect of Temperature on the Carbon,Nitrogen,and Phosphorus Nutrient Budgets of Steelhead Trout(Oncorhynchus mykiss)with Different Sizes)[J].中国海洋大学学报（自然科学英文版）,2022(05):1283-1294

Budgets,Steelhead,trient,steelhead,02kg

Effect,Temperature,Carbon,Nitrogen,Phosphorus,Nutrient,Trout,Oncorhynchus,mykiss,Different,Sizes,This,study,was,performed,evaluate,effect,carbon,nitrogen,phosphorus,budgets,adult,trout,different,body,sizes,complete,two,experiment,ducted,four,temperatures,T9,T13,T16,T19,three,65kg,S1,S2,S3,following,properties,were,determined,nutrient,intake,fecal,production,oxygen,consumption,ammonia,excretion,scope,growth,absorption,efficiency,Results,showed,no,interaction,between,terms,However,played,important,separate,roles,except,highest,treatments,decreased,increased,Nonlinear,multiple,regression,results,indicated,that,approximate,optimal,feeding,unit,weight,fish,efficiencies,significantly,higher,than,those,During,culture,daily,ratio,should,adjusted,changes,Furthermore,managers,focus,risk,hypoxia,water

0.396473