posted on October 01, 1989 04:20
D. Clay, W. T. Stobo, B. Beck, and P. C. F. Hurley
Marine Fish Division, Department of Fisheries and Oceans, Gulf Fisheries Center
P. O. Box 5030, Moncton, New Brunswick, Canada E1C 9B6
Source - Journal of Northwest Atlantic Fishery Science, Volume 9(1): 37-43
Data collected from tagging studies along the coast of Nova Scotia and offshore ichthyoplankton surveys were used to investigate growth and inshore-offshore migrations of juvenile pollock.
Age zero pollock from 0.3 to 4.2 cm in length were found in the offshore plankton between November and June and small pollock at lengths of 7-11 cm were caught inshore in July. These small pollock appear to have moved inshore after leaving the offshore pelagic community at 3-6 months of age. They remain inshore until they reach approximately 30+ cm during their second year. Tagged inshore pollock were observed to grow 17-18 cm during their first year of life, an annual instantaneous growth rate (G) of 4.1, and 27-30 cm by the end of their second year (G = 1.8). Seasonal variability in growth was also observed in juvenile pollock. Mean absolute growth from May until August was 1.75 cm per month, from August until October 1.50 cm per month, and from November until April about 0.5 cm per month.
A tagging related mortality experiment using winter tagged juveniles indicated a 11% mortality during the first 3 months after tagging.
Language - English
Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - September 1989
Publication Type - Journal Article