Use Of Fish Pituitaries To Induce Spawning In Channel Catfish PDF Download

Excerpt from The Spawning Behavior of the Channel Catfish Ictalurus Punctatus Fish for spawning were selected during the breeding season, from the middle of April to the last week in July when water temperatures ranged from 70 to 85 F According to oral reports from the Federal fish-culturists of the southwestern United States, the largest or old est fish spawn first, while the smallest fish are usually the last to spawn. Each selected female was placed with a male in an aquarium The condition of the females for spawning was rated excellent, al though it was always difficult to evaluate the exact physiological condition. Each female was well-rounded, and the roundness of the abdomen extended past the pelvics tothe genital orifice. The belly was flaccid, and the genitals were raised and reddish. The females ranged from l4'to 17 inches in length. They received pituitary injections to induce spawning. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.