Premium
Egg‐case diversity among dogfish, Scyliorhinus canicula (L.): a study of egg laying rate and nidamental gland secretory activity
Author(s) -
Mellinger J.
Publication year - 1983
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1983.tb04728.x
Subject(s) - scyliorhinus canicula , biology , captivity , photoperiodism , medicine , endocrinology , zoology , fishery , fish <actinopterygii> , botany
Egg‐case size, shape and pigmentation are distinctive features of each female lesser‐spotted dogfish, Scyliorhinus canicula. During 9 months captivity under constant conditions (water, temperature, photoperiod, food), a laying sequence reminiscent of an annual cycle was observed in three females. While oocyte size and (with exceptions) egg‐case weight remained constant, there was a marked decrease of the‘albumen’jelly secreted by the anterior halves of nidamental glands.