718 



Fishery Bulletin 100(4) 



1986-91 Samples 

 From Commercial 

 Catch 



37 42 47 

 Length (cm) 



Figure 6 



Companson of female petrale sole length frequency from 

 the 1986-91 commercial fishery samples and the September 

 samples collected in our study The 1986-91 samples were 

 also used to fit the maturity curve from Turnock et al •' 



1.25 



1.00 



075 



50 



o 

 dI 



0.25 



0,00 



20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 

 Length (cm) 



Figure 7 



Comparison of maturity cui-ves fitted to the data from our study. 

 Bars show proportion offish mature by length from the macroscopic 

 evaluations of the August and September samples. The solid line is 

 the fitted curve for those data. The dashed line is the fitted curve 

 from microscopic evaluations of the September samples only. 



at 50% maturity has been small. Collection of early fall 

 samples from the commercial catch, followed by histologi- 

 cal preparation and classification based on presence or ab- 

 sence of vitellogenin, should yield more accurate maturity 

 information for female petrale sole than winter sampling 

 on spawning aggregations or maturity sampling where 

 only a visual assessment of ovary condition is made. 



Acknowledgments 



We'd like to thank the skipper and crew of the FV Olympic. 

 Staff froin ODFW's Marine Program and from the Pacific 

 States Marine Fisheries Commission helped with sample 

 preparation. Jennifer Menkel aged the otoliths and Margo 

 Whipple of Oregon State University prepared the histo- 

 logical sections. Jim Golden and David Sampson provided 

 helpful reviews of the draft manuscript. 



Literature cited 



Al-Jufaily, and M. S. 



1996. Variation in the maturity schedule of english sole and 

 its influence on calculating the F35% target fishing rate. 

 M.S. thesis, 85 p. Oregon State Univ., Corvallis OR. 

 Best, E. A. 



1961. Savings gear studies on Pacific coast flatfish. Bull. 

 Pac. Mar Fish. Comm. 5:25-47. 

 Brodziak, J., and R. Mikus. 



2000. Variation in life history parameters of Dover sole, 

 Microstumus pacificiis, off the coasts of Washington, Ore- 

 gon, and northern California. Fish. Bull. 98:661-673. 

 Castillo, Gonzalo C. 



1995. Latitudinal patterns in reproductive life history 

 traits of northeast Pacific flatfish. In Proceedings of the 

 international symposium on north Pacific flatfish. Alaska 

 Sea Grant College Report. AK-SG-95-04, 1995, p. 51-72. 

 Alaska Sea Grant Progi-am. Fairbanks, AK. 

 Chilton, D. E., and R. J. Beamish. 



1982. Age determination methods for fishes studied 

 by the Groundfish Program at the Pacific Biological 

 Station. Can. J. Fish. Aquat. Sci. Spec. Publ. 60:2-18. 

 Clark, W. G. 



1991. Groundfish exploitation rates based on life his- 

 tory parameters. Can. J. Fish. Aquat. Sci. 48:734-750. 

 Hagerman, F B. 



1952. The biology of the Dover sole. California Dep. 

 Fish and Game, Fish Bull. 85. 48 p. 

 Ketchen, K. S., and C. R. Forrester 



1966. Population dynamics of the petrale sole. Fish. 

 Res. Board Can. Bull. 153, 195 p. 

 Lunsford, C. R. 



1999. Distribution patterns and reproductive aspects 

 of Pacific ocean perch iSebastes alutus) in the Gulf 

 of Alaska. M.S. thesis, 154 p. Univ Alaska Fair- 

 banks, AK. 

 Nichol, D. G., and E. K. Pikitch. 



1994. Reproduction of darkblotched rockfish off the 

 Oregon coast. Trans. Am. Fish. Soc. 123:469-481. 

 Ramsay, K., and P. Witthames. 



1996. Using oocyte size to assess seasonal ovarian 

 development in Solea solea. J. Sea Res. 36(3/4): 

 275-283. 



