Open AccessSexual maturation and smoltification in domesticated Atlantic salmon ( Salmo salar L.) – is there a developmental conflict?
Author(s) -
Fjelldal Per Gunnar,
Schulz Rüdiger,
Nilsen Tom O.,
Andersson Eva,
Norberg Birgitta,
Hansen Tom Johnny
Publication year - 2018
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.13809
Subject(s) - smoltification , salmo , sexual maturity , gonadosomatic index , domestication , biology , photoperiodism , zoology , endocrinology , medicine , fishery , salmonidae , ecology , fish <actinopterygii> , population , environmental health , fecundity , horticulture
We present data from two experiments that examined how the developmental processes of smoltification and sexual maturation proceed in parallel in domesticated Atlantic salmon. Onset of maturation and smoltification was stimulated using temperature and photoperiod. Our observations on gonadosomatic index ( GSI ), spermatogenic activity, gill Na+, K+‐ ATP ase enzyme ( NKA ) activity, and plasma 11‐ketotestosterone (11‐ KT ), Na, Cl, and Ca show that smoltification and maturation were both triggered and developed in parallel in male Atlantic salmon, but that the progressing maturation impaired hypoosmoregulation. Female maturation started after completion of smoltification. Furthermore, we present data showing that domesticated salmon can physiologically smoltify–desmoltify–resmoltify within a short period of time, and that development of a secondary sexual characteristic, such as a kype, depends on size in male postsmolts.