Branchial Sodium-Potassium ATPase Activity and Growth of Rainbow Trout in Seawater

Johnston, Carol E.; Birt, Tim P.; Murphy, Jenny

doi:10.1577/1548-8659(1983)45[19:bsaaag]2.0.co;2

Cited by 7 publications

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“…Gradual transition from freshwater to sea water can improve the salinity adaptability of fish, which has been indicated in several studies (Iwata et al, 1985; Johnston et al, 1983; Johnston & Cheverie, 1985). In our results, the SGR, survival rates, FC and FCE of rainbow trout and steelhead trout in the T2 treatments were significantly higher than those in the T6 and T30 treatments.…”

Section: Discussionmentioning

confidence: 88%

“…The salinity tolerance of the anadromous species is stronger than that of the landlocked species, but it can be improved with salinity acclimation (Johnsson & Clarke, 1988; Johnston & Cheverie, 1985; Landless, 1976). The survival rate of salmonids after the transition to sea waters significantly affected by the acclimation rate (Iwata et al, 1985; Johnston, Birt, & Murphy, 1983; Johnston & Cheverie, 1985).…”

Section: Introductionmentioning

confidence: 99%

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Growth, osmoregulation and energy budget of rainbow and steelhead trout under different salinity acclimation methods and the best transition size of steelhead trout

Xiong

Huang

Zhou

et al. 2020

Aquaculture Research

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In order to meet the demand of salmon market, Chinese scientists and entrepreneurs are working on salmon mariculture far offshore in the Yellow Sea, China. Rainbow, steelhead trout and Atlantic salmon were selected as the main culture species. The aims of the present study were as follows: (a) investigate the effect of the salinity acclimation method on the growth, osmoregulation and energy budget in two forms of Oncorhynchus mykiss, rainbow and steelhead trout and (b) explore the optimal size of steelhead trout for the seawater entry. In trial I, rainbow (mean = 99.44 g) and steelhead trout (mean = 99.01 g) were reared for 40 days after undergoing salinity acclimation at three rates: an abrupt increase in salinity from 0 to 30 g/L (T30); an abrupt increase in salinity to 14 g/L, followed by a daily increase of 2 g/L (T2) or 6 g/L (T6) until reaching 30 g/L; and no salinity exposure (control treatment) (T0). In trial II, steelhead trout with body weights of approximately 100 and 400 g were cultured for 60 days with two treatments, T0 and T2, and the specific growth rate (SGR) was calculated every 10 days. In trial I, in both kinds of fish, the optimal growth performance, survival rate, osmoregulation and energy budget were observed in the T0 treatment, followed by the T2 treatment. These results indicate that O. mykiss with a body weight of approximately 100 g can adapt to sea water with a gradual transition (T2), but they are still not suitable for the seawater entry because of low growth. Based on the recorded SGRs in trial II, our formulated regression formula revealed that approximately 200 g is the optimal size of steelhead trout for the transition to sea water.

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Section: Discussionmentioning

confidence: 88%