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Increased daylength stimulates plasma growth hormone and gill Na+, K+-ATPase in Atlantic salmon (Salmo salar)

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Abstract

Atlantic salmon juveniles reared at constant temperature (9–10°C) were exposed to four photoperiod treatment and sampled every 2 weeks from January through May. Fish reared under normal photoperiod exhibited eight-and three fold increases in plasma growth hormone and gill Na+, K+-ATPase activity, respectively, between January and April. Fish exposed to abrupt increases in daylength (LD 15:9) in February or March responded with earlier increases in plasma growth hormone and gill Na+, K+-ATPase activity, and earlier decreases in condition factor relative to fish in the normal photoperiod group. Fish maintained under short daylength (LD 9:15) from January to May exhibited delayed and muted increases in plasma growth hormone and gill Na+, K+-ATPase activity. Plasma thyroxine exhibited a 2.5-fold increase from February to late March in the normal photoperiod group, was generally lower in the LD 9:15 group, but exhibited no obvious response to abrupt increases in daylength. There was an increase in plasma 3,5,3′-triiodo-l-thyronine with time in all groups (43–80%) but no significant response to photoperiod. Plasma levels of somatostatin-25 were highest in the LD 9:15 group, but there was no detectable response to increased daylength in any of the photoperiod treatments. The results indicate that plasma growth hormone is responsive to increased daylength and may be causally related to subsequent increases in gill Na+, K+-ATPase.

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Abbreviations

ANOVA :

two-way analysis of variance

BCA :

bicinchoninic acid

BSA :

Bovine serum albumin

EDTA :

ethylene diamine tetraacetic acid

ELISA :

enzyme-linked immunosorbent assay

EST :

eastern standard time

GH :

growth hormone

GLU :

Glucagen

IgG :

Immunoglobulin G

INS :

Insulin

LDN :

Simulated natural photoperiod

RIA :

radio immuno assay

RIA :

radio immuno assay

SEI :

Sucrose EDTA imidazole

SS-25:

somatostatin-25

SW :

sea water

T 3 :

3,5,3′ triiodo-l-thyronine

T 4 :

thyroxine

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Author notes

  1. C. Eilerlson

    Present address: Department of Anatomy and Cell Biology, Emory University, School of Medicine, Atlanta, GA, USA

Authors and Affiliations

  1. Anadromous Fish Research Center, National Biological Service, P.O. Box 796, 04376, Turners Falls, MA, USA

    S. D. McCormick, J. B. Carey & M. O'Dea

  2. Department of Zoophysiology, Göteborg University, Sweden

    B. Th. Björnsson

  3. Department of Zoology, North Dakota State University, ND, USA

    M. Sheridan & C. Eilerlson

Authors
  1. S. D. McCormick
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  2. B. Th. Björnsson
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  3. M. Sheridan
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  4. C. Eilerlson
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  5. J. B. Carey
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  6. M. O'Dea
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Communicated by H. Langer

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McCormick, S.D., Björnsson, B.T., Sheridan, M. et al. Increased daylength stimulates plasma growth hormone and gill Na+, K+-ATPase in Atlantic salmon (Salmo salar). J Comp Physiol B 165, 245–254 (1995). https://doi.org/10.1007/BF00367308

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