CA Market Squid: Research Changing Future Management
This story entered on 30th Aug, 2004 10:17:45 AM PST
The California market squid (Loligo opalescens Berry)
is the prime focus of California fishery operations, making it California's
largest fishery. It has ranked first in dollar value and tons landed
in recent years. The California Department of Fish and Game (CDFG),
responsible for managing the California market squid, has received
limited support for research into the squid's life history and reproductive
behavior. Consequently, CDFG has largely based its management
decisions on findings and observations that suggest squid spawn
Results from NURP-sponsored research, recently published
in Fishery Bulletin and Marine Biology, suggest that California
market squid lay most of their eggs during the day, and not at night,
as has been previously assumed. This finding may have major
implications on the future management of squid in California.
Note: Roger Hanlon and Nuutti Kangas of the Marine Biological Laboratory
at Woods Hole, and John Forsythe of the National Resource Center
for Cephalopods at the University of Texas, conducted this work
over a sixteen-month period, with funding from NURP's West Coast
and Polar Regions Center. Research was conducted using remotely
operated vehicles (ROVs) to collect systematic video data of mating
and egg-laying behavior. The in-situ observations in Monterey Bay
clearly showed that normal mating and egg-laying behavior occur
only during the daytime, ending at dusk. Furthermore, results indicate
that the rate of egg laying is slow, suggesting that egg beds are
built up over many days, not in rapid spawning events that are assumed
to occur over one to two nights.
John Forsythe, Nuuti Kangas, and Roger T Hanlon. 2004.
Does the California market squid (Loligo opalescens Berry) spawn
naturally during the day or at night? A note on the successful use
of ROVs to obtain basic fisheries biology data. Fishery Bulletin.
2 (102): 389 - 392.
Roger T. Hanlon, Nuuti Kangas, and John W. Forsythe.
2004. Egg-capsule deposition and how behavior interactions influence
spawning rate in the squid Loligo opalescens in Monterey Bay, California.
Marine Biology, 145: 923-930.
Name: Jennifer Reynolds
Tel: (907) 474-5871