Cruise Report 55-S-1 - Aquatic Commons

							                                 State of   Califo~a
                            DEPARTf.1ENT OF FISH A~ND GAl'.m


                   MARINE FISHERIES BRAl'TCH - M.V.    N.B. SCOFIELD
                                   Cruise Report


Cruise:     Cruise 1 of the M.V. N.B. Scofield for 1955. (55-5--1)
            Sailed: January 5; 19,5 from Los Angeles Harbor.
            Returned: March 1, 1955 to Los Angeles Harbor.

Locality:   Offshore from Mexico,      l~icaragua,    Costa Rica, and Panama.

Purpose:    ft.     Tag small yellowfin tuna and skipjack -with "spaghetti U tags.
            B.      Further delineate the spawning range of the above species by
                    collecting post-larval specimens under a night light.
            C.      Collect small yellowfin tuna and skipjack for age determinations
                    and stomach analysis.
            D.      Collect post-larval tunas for aquarium observations.
            E.      ](akelimited oceanographic observations.
            F.      Collect specimens of other species for further study.

Results:    A total of 578 fish was tagged:

                                     Yellowf'in                  Yellmvta.il     Totals

            Baja California                                            1           1

                                        237                                       237
            T·Jicaragua                   16                                      16
            Costa Rica                    97            7                        104

            Cocos Id.                                    2                          2

            Panama                     ...!22.         19
                                                                                -218
                  Grand Totals          549            28              1         $78
            Extensive night light collections 11\]ere made and among the specimens
            identified were several post,..larval yello1'1fin tuna.        Further studies
            are being made on these at present.
            Several small yellowfin were preserved whole for age analysis and
            scale samples were saved from others. Stomach samples and morphometric
            measurements were taken from various sizes of yellowfin and skipjack.

            Post-larval yellowfin were successfully kept alive in an aquarium for
            as long as tV10 weelcs. A rapid rate of growth caused them to outgrow
            the aquarium and death resulted.

            Surface temperature observations were made during the entire cruise
            and nine bathythermograph casts were made off rvlexico.
                                     - 2 -

           Several hundred other specimens were saved alive or preserved frozen
           or in fonnaldehyde. '!hese are being identified at present and will
           be disposed of to various interested insti tutions and agencies. The
           live specimens have been placed in larger tanks for observations at
           the ~Aarine Oceanarium.

Scientific Personnel:   Harold B. Clemens, Biologist in charge
                        Lee Tebo, Biologist
                        ~tl.chel
                               Angot, visi ting biologist from France




14,--3/9/55
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