Studies on the reproductive biology of Pacific cod and English sole in Hecate Strait from the cruise of the FR/V W.E. Ricker, November 25-29, 1986 / by A.V. Tyler, J. Fargo, R.P. Foucher, and J.B. Lucas.: Fs97-4/1937E-PDF

"The cruise reported on here is part of a series of cruises designed to investigate the reproductive biology of Pacific cod and English sole. The objective of the program is to document spawning timing and location, the rate of oocyte development, and whether spawning timing depends on size of fish, water temperature, or stock density. We will determine during the program whether there are differences in response between the Hecate Strait stock and the LaPerouse stock. We are also investigating fecundity, and whether there are changes in fecundity with similar factors. The investigation of maturation cycle is being carried out through histological preparations and ovary weighing. Fecundity is being investigated by freeing oocytes from ovarian tissue and counting subsamples. Findings reported on include length-frequency distributions, percentage mature ogives, length-weight data, and ovary weight-fish weight data. Pacific cod ranged from 25 cm to 51 cm, and showed modes at 29 cm and 40 cm. There were too few mature Pacific cod taken to determine the median size at maturity, and the relation between ovary weight and body weight was also indeterminate for fish larger than 1 kg, though there was a positive slope for immatures. English sole ranged from 16 to 48 cm. Median size at maturity was 34.3 cm. The relationship between ovary weight and body weight was linear, with an overall mean ovary weight of 5.5 g corresponding to a mean body weight of 601 g"--Abstract, page iii.

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