<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The aims of this study were to determine the influence of the factors affecting fin damage under different rainbow trout production systems and to compare the findings with the known experimental reports. The study was based on a questionnaire that included information about the main factors i.e. oxygen level in exit water, water temperature, stocking density, daily feed ration, number of meals and grading frequency on seven rainbow trout farms. Standard multiple regression analysis, based on a previously published fin damage dataset, was used to assess the relationship between the level of fin damage per fin and the factors. Daily feed ration received the strongest weight in the model for the caudal, anal and both pectoral fins, whereas number of meals received the strongest weight in the model for both pelvic fins. Grading frequency received the strongest weight only in the dorsal fin model. Lower levels of daily feed ration and number of meals combined with higher water temperature increased the level of fin damage, whereas stocking density had no effect. The results conform to the experimental research on fin damage in rainbow trout. The research model contributes to the overall assessment of fish welfare and the regression analysis used in this study could be used on rainbow trout farms to evaluate the effect of the main factors on the level of fin damage.</p></abstract>

The aims of this study were to determine the influence of the factors affecting fin damage under different rainbow trout production systems and to compare the findings with the known experimental reports. The study was based on a questionnaire that included information about the main factors i.e. oxygen level in exit water, water temperature, stocking density, daily feed ration, number of meals and grading frequency on seven rainbow trout farms. Standard multiple regression analysis, based on a previously published fin damage dataset, was used to assess the relationship between the level of fin damage per fin and the factors. Daily feed ration received the strongest weight in the model for the caudal, anal and both pectoral fins, whereas number of meals received the strongest weight in the model for both pelvic fins. Grading frequency received the strongest weight only in the dorsal fin model. Lower levels of daily feed ration and number of meals combined with higher water temperature increased the level of fin damage, whereas stocking density had no effect. The results conform to the experimental research on fin damage in rainbow trout. The research model contributes to the overall assessment of fish welfare and the regression analysis used in this study could be used on rainbow trout farms to evaluate the effect of the main factors on the level of fin damage.

Factors Affecting Fin Damage of Farmed Rainbow Trout

Veterinary Institute, Faculty of Veterinary Medicine, Ss. Cyril and Methodius University in Skopje, Lazar Pop-Trajkov 5-7, 1000 Skopje, Republic of Macedonia

Veterinary Institute, Faculty of Veterinary Medicine Ss. Cyril and Methodius University in Skopje Lazar Pop-Trajkov 5-7, 1000 Skopje Republic of Macedonia

Fishery Department, Faculty of Biotechnical Sciences, St. Kliment Ohridski University in Bitola, Partizanska bb, 7000 Bitola, Republic of Macedonia

Fishery Department, Institute of Animal Science, Ss. Cyril and Methodius University in Skopje, Bul. Ilinden 92-a, 1000 Skopje, Republic of Macedonia

Macedonian Veterinary Review

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Factors Affecting Fin Damage of Farmed Rainbow Trout"}

The aims of this study were to determine the influence of the factors affecting fin damage under different rainbow trout production systems and to compare the...

Factors Affecting Fin Damage of Farmed Rainbow Trout

Published Online: Nov 18, 2015

Page range: 61 - 71

Received: Jul 13, 2014

Accepted: Nov 15, 2014

DOI: https://doi.org/10.14432/j.macvetrev.2014.11.032

Keywords
rainbow trout, factor, fin condition, fish welfare

© 2015

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Factors Affecting Fin Damage of Farmed Rainbow Trout

Published Online: Nov 18, 2015

Page range: 61 - 71

Received: Jul 13, 2014

Accepted: Nov 15, 2014

DOI: https://doi.org/10.14432/j.macvetrev.2014.11.032

Keywordsrainbow trout, factor, fin condition, fish welfare

© 2015

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
rainbow trout, factor, fin condition, fish welfare