Vertically-Suspended Environmental Enrichment Improves Growth of Landlocked Fall Chinook Salmon during Initial Hatchery Rearing

Environmental enrichment has been shown to improve juvenile salmonid growth during hatchery rearing. This study examined the effects of vertically-suspended environmental enrichment starting seven days after feed training and continuing for the next 32 days of landlocked fall Chinook salmon (Oncorhynchus tshawytscha) rearing. At the end of this experiment, final tank weights, gain, percent gain, and feed conversion ratio were all significantly improved in the tanks of salmon with environmental enrichment compared to barren tanks, with a nearly 25% improvement in feed conversion ratio. Individual salmon in tanks with environmental enrichment were significantly longer and weighed significantly more than salmon from tanks without enrichment. Specific growth rate was also significantly improved with the use of enrichment. The use of vertically-suspended environmental enrichment to improve growth and rearing efficiency is recommended during the initial rearing of landlocked fall Chinook salmon.

[1]  Nathan Huysman,et al.  Influence of Water Velocity and Vertically-Suspended Structures on Rainbow Trout Rearing Performance , 2020 .

[2]  O. Lekang Aquaculture Engineering , 2019 .

[3]  D. Noakes,et al.  Reduced stress response in juvenile Chinook Salmon reared with structure , 2019, Aquaculture.

[4]  Nathan Huysman,et al.  Use of a Large Vertically-Suspended Rod Array in Circular Tanks during Juvenile Rainbow Trout Rearing , 2019 .

[5]  Nathan Huysman,et al.  Rearing Performance of Atlantic Salmon Grown in Circular Tanks with Vertically-Suspended Environmental Enrichment , 2019, Open Journal of Animal Sciences.

[6]  Joseph M. Barnes,et al.  Vertically-Suspended Environmental Enrichment Alters the Velocity Profiles of Circular Fish Rearing Tanks , 2019, World Journal of Engineering and Technology.

[7]  Nathan Huysman,et al.  Use of Two Vertically-Suspended Environmental Enrichment Arrays during Rainbow Trout Rearing in Circular Tanks , 2019, International Journal of Innovative Studies in Aquatic Biology and Fisheries.

[8]  Brian Fletcher,et al.  Vertically-Suspended Environmental Enrichment Structures Improve the Growth of Juvenile Landlocked Fall Chinook Salmon , 2019, International Journal of Innovative Studies in Aquatic Biology and Fisheries.

[9]  Nathan Huysman,et al.  Suspended Arrays Improve Rainbow Trout Growth during Hatchery Rearing in Circular Tanks , 2018 .

[10]  K. Crank,et al.  Enrichment of Circular Tanks with Vertically Suspended Strings of Colored Balls Improves Rainbow Trout Rearing Performance , 2018 .

[11]  Nathan Huysman,et al.  Use of Suspended Plastic Conduit Arrays during Brown Trout and Rainbow Trout Rearing in Circular Tanks , 2018, North American Journal of Aquaculture.

[12]  V. Braithwaite,et al.  Becoming a better swimmer: structural complexity enhances agility in a captive-reared fish. , 2017, Journal of fish biology.

[13]  E. Krebs,et al.  Use of Bottom Structure and Tank Cover during Rainbow Trout Rearing in Circular Tanks , 2017 .

[14]  G. Simpson,et al.  Flow Patterns in Circular Rearing Tanks Containing Vertical Structure , 2016 .

[15]  J. Kientz,et al.  Structural Complexity Improves the Rearing Performance of Rainbow Trout in Circular Tanks , 2016 .

[16]  T. Parker,et al.  Full and Partial Overhead Tank Cover Improves Rainbow Trout Rearing Performance , 2016 .

[17]  T. Parker,et al.  Effects of Different Water Velocities on the Hatchery Rearing Performance and Recovery from Transportation of Rainbow Trout Fed Two Different Rations , 2015 .

[18]  C. Garcia de Leaniz,et al.  Silver spoons in the rough: can environmental enrichment improve survival of hatchery Atlantic salmon Salmo salar in the wild? , 2014, Journal of fish biology.

[19]  T. Parker,et al.  Rearing velocity impacts on landlocked fall Chinook salmon (Oncorhynchus tshawytscha) growth, condition, and survival. , 2014 .

[20]  V. Braithwaite,et al.  Environmental enrichment promotes neural plasticity and cognitive ability in fish , 2013, Proceedings of the Royal Society B: Biological Sciences.

[21]  B. Berejikian Rearing in Enriched Hatchery Tanks Improves Dorsal Fin Quality of Juvenile Steelhead , 2005 .

[22]  Lizzie Tuckey,et al.  Effects of Photoperiod and Substrate on Larval Development and Substrate Preference of Juvenile Southern Flounder, Paralichthys lethostigma , 2001 .

[23]  B. Berejikian,et al.  Social dominance, growth, and habitat use of age-0 steelhead (Oncorhynchus mykiss) grown in enriched and conventional hatchery rearing environments , 2000 .

[24]  Michael B. Timmons,et al.  Review of circular tank technology and management , 1998 .

[25]  E. Wagner,et al.  Experimental use of cobble substrates in concrete raceways for improving fin condition of cutthroat (Oncorhynchus clarki) and rainbow trout (O. mykiss) , 1995 .

[26]  J. Eales,et al.  Influence of Sustained Exercise at Two Ration Levels on Growth and Thyroid Function of All-Female Chinook Salmon (Oncorhynchus tshawytscha) in Seawater , 1994 .

[27]  B. Howell,et al.  Observations on the growth, survival and disease resistance of juvenile common sole, Solea solea (L.), fed Mytilus edulis L. , 1993 .

[28]  Kenneth A. Leon Effect of Exercise on Feed Consumption, Growth, Food Conversion, and Stamina of Brook Trout , 1986 .

[29]  K. Fausch,et al.  Profitable stream positions for salmonids: relating specific growth rate to net energy gain , 1984 .

[30]  Galen L. Buterbaugh,et al.  A Feeding Guide for Brook, Brown, and Rainbow Trout , 1967 .