Hardy, Robert A.

English

Aquatic Commons

State of California - The Resources Agency
Department of Fish and Game
Marine Resources Region
Long Beach, California
CRUISE REPORT 74-KB-15 LOBSTER INVESTIGATIONS
Prepared by Robert A. Hardy
Vessel:
Dates:
Locality:
Purpose:
R/V KELP BASS
May 20-22, 1974
Santa Catalina Island
1. To collect California spiny lobster, PanuZirus
interruptus, for life history studies and marking.
2. To evaluate escape ports in commercial traps.
Procedure: Trapping for lobster was conducted in areas of suitable
lobster habitat in the vicinity of Isthmus Cove utilizing
both commercial traps (2- x 4-inch mesh) and small-mesh
(1- x I-inch and 1- x 2-inch) traps~ Traps were fished
at depths ranging from 6-21 m (20-70 ft). All lobster
caught were measured and sexed and all those from 48-111
rom (1.9-4~4 inches) carapace length were marked with coded
tail punches corresponding to 3 rom (0.12 inches) CL size
groupingse
Lobsters' of known size were placed in four commercial traps
fitted with different size escape ports. To evaluate es-
capement the escape ports were all 6.0 em (2 3/8 inches)
high and ranged from 9.8-14.0 em (3 7/8-5 1/2 inches) in
widthe
Results: Two nights of trapping, with a combined total of 90 trap-
sets pulled, resulted in a total catch of 336 lobster.
Marked recaptures accounted for 27.7% of the catch and 217
were new captures. The new captures were ~arked and all
were released in the general area of captureg None of the
recaptured lobster had moulted since being marked~ Female
lobster comprised 50% of the catch and 61% of these were
ovigerous.
A total of 51% of the sublegal sized lobster placed in test
traps escaped; ho~ever, this was not felt to be adequate
and we plan additional tests on future cruises~
Personnel: M~ Mazarovich, Vessel Captain
R~ Hardy, Biologist-in-charge
M. Odemar, Biologist
Ce Haugen, Biologist
MRR-LB/150
6-24-74/pb


Cruise Report 74-KB-15: Lobster investigations

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Cruise Report 74-KB-15: Lobster investigations

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