U.S. Department 
of Commerce 
Seattle, Washington 
Volume 99 
Number 1 
January 2001 
Fishery 
Bulletin 
Contents 
The conclusions and opinions expressed 
in Fishery Bulletin are solely those of the 
authors and do not represent the official 
position of the National Marine Fisher- 
ies Service (NOAA) or any other agency 
or institution. 
The National Marine Fisheries Service 
(NMFS) does not approve, recommend, or 
endorse any proprietary product or pro- 
prietary material mentioned in this pub- 
lication. No reference shall be made to 
NMFS, or to this publication furnished by 
NMFS, in any advertising or sales pro- 
motion which would indicate or imply 
that NMFS approves, recommends, or 
endorses any proprietary product or pro- 
prietary material mentioned herein, or 
which has as its purpose an intent to 
cause directly or indirectly the advertised 
product to be used or purchased because 
of this NMFS publication. 
Articles 
1-14 Begg, Gavin A., Wiiliam J. Overholtz, and 
Nancy J. Munroe 
The use of internal otolith morphometries for identification of haddock 
(Metanogrammus aeglefinus ) stocks on Georges Bank 
15-28 Brown-Peterson, Nancy J., Robin M. Overstreet, 
Jeffrey M. Lotz, James S. Franks, and Karen M. Burns 
Reproductive biology of cobia, Rachycentron ccinadum, 
from coastal waters of the southern United States 
29-39 Caretta, James V., Barbara L. Taylor, and Susan J. Chivers 
Abundance and depth distribution of harbor porpoise 
( Phocoena phocoena ) in northern California determined 
from a 1995 ship survey 
40-48 Dagorn, Laurent, Erwan Josse, and Pascal Bach 
Association of yellowfin tuna ( Thunnus albacares) with tracking vessels 
during ultrasonic telemetry experiments 
49-62 Gharrett, Anthony J., Andrew K. Gray, and 
Jonathan Heifetz 
Identification of rockfish ( Sebostes spp.) by restriction site analysis of 
the mitochondrial ND-3/ND-4 and 12S/16S rRNA gene regions 
Companion articles 
63-71 Harvey, Euan, David Fletcher, and Mark Shortis 
A comparison of the precision and accuracy of estimates of 
reef-fish lengths determined visually by divers with estimates 
produced by a stereo-video system 
72-80 Harvey, Euan, David Fletcher, and Mark Shortis 
Improving the statistical power of length estimates of reef fish: 
a comparison of estimates determined visually by divers with 
estimates produced by a stereo-video system 
