Abstract
This experiment evaluated the use of an exercise routine and vertically-sus-pended structure during juvenile landlocked fall Chinook salmon (Oncorhynchus tshawytscha; mean ± SE, initial weight 1.47 ± 0.03 g, total length 56.4 ± 0.4 mm) rearing. Four treatments were used: 1) no exercise routine nor vertically-suspended structure, 2) exercise and structure, 3) exercise and no structure, and 4) no exercise and structure. Water velocities in tanks without exercise were 12 cm/s, where-as the exercise routine consisted of seven days at 12 cm/s followed by seven days at 18 cm/s. The structure was an array consisting of four vertically-suspended aluminum angles. Total tank gain and percent gain were significantly greater after 50 days in the tanks of salmon subjected to the exercise routine and structure compared to the three other treatments. Gain and percent gain were also significantly greater in the tanks receiving structure without exercise compared to tanks with exercise and no structure or tanks with neither exercise nor structure. Feed conversion ratio was significantly improved in the salmon tanks with structure and without exercise compared to all other treatments. There were no significant differences for individual fish weight, total length, specific growth rate, or condition factor among any of the treatments at the end of the experiment. These results indicate that the use of both an exercise routine and vertically-suspended structure may be beneficial during the rearing of juvenile landlocked fall Chinook salmon.
Highlights
This experiment evaluated the use of an exercise routine and vertically-suspended structure during juvenile landlocked fall Chinook salmon (Oncorhynchus tshawytscha; mean ± SE, initial weight 1.47 ± 0.03 g, total length 56.4 ± 0.4 mm) rearing
There were no significant differences for individual fish weight, total length, specific growth rate, or condition factor among any of the treatments at the end of the experiment. These results indicate that the use of both an exercise routine and vertically-suspended structure may be beneficial during the rearing of juvenile landlocked fall Chinook salmon
Gain, and percent gain were all significantly greater in the tanks of fish receiving both an exercise routine and structure compared to all other treatments (Table 1)
Summary
Parts of trees [16] [17] [18] [19] [20], cobble [19] [21] [22] [23], artificial plant material [24] [25] [26] [27] [28], concrete blocks [29], and polyvinyl chloride [17] [27] [28] [30] [31] [32] have all been added to hatchery rearing tanks Many of these structures have produced positive results, they are not practical on a production scale because the addition of these structures impedes the hydraulic selfcleaning nature of circular tanks, dramatically increasing tank cleaning labor and the possibility of disease outbreaks [29] [33] [34]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
