Optimization of feeding and growth conditions for walleye pollock Theragra chalcogramma (Pallas) larvae reared in the laboratory
By: by Steven M. Porter and Kevin M. Bailey.
Contributors: Bailey, Kevin McLean.; Alaska Fisheries Science Center (U.S.)
Series: AFSC processed report -- 2007-06.
Publisher: Alaska Fisheries Science Center, National Marine Fisheries Service, U.S. Dept. of Commerce
Published: 2007
Place of publication: [Seattle, Wash.]
Language: eng
Number of pages: 20
Subjects: Walleye pollock -- Larvae -- Feeding and feeds.; Walleye pollock -- Larvae -- Growth.; Walleye pollock -- Larvae -- Effect of light on.; Walleye pollock -- Larvae -- Effect of temperature on.; Walleye pollock -- Larvae -- Effect of predation on.
Description: A series of experiments were conducted to identify optimal rearing conditions for walleye pollock Theragra chalcogramma (Pallas) larvae. Experiments examined the influence of light spectrum (amount of ultraviolet (UV) light), temperature, prey type and density, first exposure to prey, and turbulence. Natural prey (zooplankton), prey density, and temperature positively affected feeding and/or growth. Moderate turbulence, and age of first exposure to prey were not important factors. UV light had a negative effect on feeding and growth. The optimum conditions for rearing walleye pollock larvae include temperatures near 10⁰ C, a natural zooplankton diet (minimum prey density of 500 per liter), full spectrum fluorescent light bulbs, and clear, acrylic tank covers used to reduce the amount of UV light entering the tank to lessen the chance of UV light injury to the larvae. Visible light level should not exceed 13 umol photons per m² per second.
Notes: "July 2007."

Includes bibliographical references (p. 9-10).

Also available online via the Alaska Fisheries Science Center publications home page.