we investigated the environmental impact of trout farm discharge on zayandeh-rud river. three farms with different production capacities; 250, 25 and 70 tones were assigned to this study. five sampling sites were designated to each farm. benthic macroinvertebrates were collected in autumn, winter, and spring using the quantitative techniques. a total of 11 classes, 16 orders and 53 families&apo...

Herein, data on rainbow trout infections with the copepod Caligus lacustris in cage aquaculture Lake Ladoga is presented. (n = 127 ex.) were collected from a farm housing cage-reared to describe size–age and sex structure of population. Morphological features copepods evaluated according 10 characters terminology proposed by Kabata Gusev (J Linn Soc (Zool) 46(309):155–207, 1966). To determine p...

In recent years due to climate warming algal blooms have been observed in some boreal lakes during summer and autumn months, which reduces the quality of water. We studied distribution chlorophyll "a" Lake Kroshnozero (North-western Russia) 2021 2022. This lake has used for fisheries more than 50 years, currently there is a trout farm there. influence temperature, turbidity transparency water o...

If farmers are risk averse, greater farm income variability should increase off-farm labor supply. This effect is confirmed for a sample of Kansas farmers. Off-farm employment of farmers and their spouses is also found to be significantly influenced by farm experience, off-farm work experience, farm size, leverage, efficiency, and farm-specific education. In addition, farm operators and spouses...

The research was carried out in the Congalla district between April and September 2018 focused on analyzing production economic profitability of trout (Oncorhynchus mykiss) farming by local market. areas, profitability, supply, demand forms consumption were determined; regional market; As a primary source information, it obtained through interviews with producers, traders consumers (Congalla-An...

Heavy metal removal from the water was studied by using fish bones produced in trout farm of Atatürk University Faculty Fisheries. Fish used as adsorbent were obtained rainbow (Oncorhynchus mykiss). Trout bone its natural form. According to experimental results that maximum Pb (II) adsorption capacity 188.16 mg/g. The Langmuir, Freundlich, and Temkin isotherm models applied describe on bones. L...

Rainbow trout performance in foodlimited environments: implications for future assessment and management Daniel C. Josephson a , Jason M. Robinson b , Jesse M. Lepak c & Clifford E. Kraft a a Department of Natural Resources, Cornell University, Ithaca, NY 14853-3001, USA b Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, MD 20688, USA c Colora...