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Hormonally Induced Ovulation of Northern Pike via Sustained‐Release Vehicles
Author(s) -
Szabó Tamás
Publication year - 2001
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/1548-8454(2001)063<0137:hioonp>2.0.co;2
Subject(s) - pike , biology , ovulation , zoology , fishery , endocrinology , hormone , fish <actinopterygii>
Abstract Although ovulation in northern pike Esox lucius can be induced by injections of dried fish pituitary‐in‐saline solutions, incomplete ovulation and low fertilization rates limit large‐scale production of fry. The pituitary treatment was modified by using sustained‐release vehicles, a hydrophilic biodegradable matrix of carboxymethylcellulose sodium (CMC‐Na) and a Carbopol resin. Administration of carp pituitary in an 8.0% solution of CMC‐Na or in a 2.0% aqueous dispersion of Carbopol resin produced a higher mean fecundity index and improved fertilization rate than pituitary injected in saline in some trials. The results suggest that, in northern pike, the rate of increase of the ovulation‐inducing hormone may influence the relative quantity and fertilization rate of the ovulated eggs. Thus, modification in hormone administration may improve induced breeding techniques for this species.