Interaction of temperature and photoperiod on male postsmolt maturation of Atlantic salmon (Salmo salar L.)

Martinez, Enrique Pino; Balseiro, Pablo; Fleming, Mitchell S.; Stefansson, Sigurd O.; Norberg, Birgitta; Imsland, Albert K.; Handeland, Sigurd O.

doi:10.1016/j.aquaculture.2023.739325

Cited by 8 publications

(1 citation statement)

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“…For males, there were no differences in length between salmon caught in the open Baltic Sea and the ones at the river mouths (one‐way ANOVAs, p > 0.05); for females these differences in length comparing salmon caught in the open Baltic Sea and individuals at the river mouths were significant (one‐way ANOVAs, p < 0.05) except for individuals caught in Umeälven river mouth (one‐way ANOVA, F 1,25 = 0.74, p = 0.399). Although smaller and in some cases significantly, salmon caught in the open Baltic were probably ready to migrate towards their natal rivers given their GSI values (Table 2) higher than GSI threshold for the onset of maturation in Atlantic salmon of 0.06 and 0.3% defined by previous studies (Peterson & Harmon, 2005; Davidson et al, 2016; Martinez, Balseiro, Fleming, et al, 2023; Martinez, Balseiro, Stefansson, et al, 2023). Length of the fish also tended to vary somewhat between sampling occasions in each river but not significantly (one‐way ANOVAs, p > 0.05), except for females in Drammen (one‐way ANOVA, F 2,24 = 6.94, p = 0.004) and Driva rivers (one‐way ANOVA, F 1,15 = 7.41, p = 0.016).…”

Section: Resultsmentioning

confidence: 71%

Thiamin dynamics during the adult life cycle of Atlantic salmon (Salmo salar)

Todisco,

Fridolfsson,

Axén

et al. 2023

Journal of Fish Biology

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Thiamin is an essential water‐soluble B vitamin known for its wide range of metabolic functions and antioxidant properties. Over the past decades, reproductive failures induced by thiamin deficiency have been observed in several salmonid species worldwide, but it is unclear why this micronutrient deficiency arises. Few studies have compared thiamin concentrations in systems of salmonid populations with or without documented thiamin deficiency. Moreover, it is not well known whether and how thiamin concentration changes during the marine feeding phase and the spawning migration. Therefore, samples of Atlantic salmon (Salmo salar) were collected when actively feeding in the open Baltic Sea, after the sea migration to natal rivers, after river migration, and during the spawning period. To compare populations of Baltic salmon with systems without documented thiamin deficiency, a population of landlocked salmon located in Lake Vänern (Sweden) was sampled as well as salmon from Norwegian rivers draining into the North Atlantic Ocean. Results showed the highest mean thiamin concentrations in Lake Vänern salmon, followed by North Atlantic, and the lowest in Baltic populations. Hence, salmon in the Baltic Sea seem to be consistently more constrained by thiamin than salmon in other systems. Condition factor and body length had little to no effect on thiamin concentrations in all systems, suggesting that there is no relation between the body condition of salmon and thiamin deficiency. In our large spatiotemporal comparison of salmon populations, thiamin concentrations declined toward spawning in all studied systems, suggesting that the reduction of thiamin concentration arises as a natural consequence of starvation rather than to be related to thiamin deficiency in the system. These results suggest that factors affecting accumulation during the marine feeding phase are key for understanding the thiamin deficiency in salmonids.This article is protected by copyright. All rights reserved.

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