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Culture Technology to Support Restoration of Herring in PWS Quarterly Tasks

2007 Quarterly Project Tasks:

1st Quarter Tasks (October 1, 2006 - December 31, 2006)
Status: Complete

Tasks to be performed:

Project funding approved by Trustee Council

Progress report:

(Not Available)

2nd Quarter Tasks (January 1, 2007 - March 31, 2007)
Status: Complete

Tasks to be performed:

Annual Marine Science Symposium

Progress report:

February: Coordinated with Virginia Tech Aquaculture Center personnel and visitation at Alutiiq Shellfish Hatchery in Seward, Alaska to scope facility needs and laboratory design for adaptation to herring culture. February 26: Fish resource Permit (FRP) and Fish Transport Permit (FTP) approved by ADF&G Commission for transport of herring or herring spawn from PWS to Seward facility. March 1: Finalized contract with Alutiiq Shellfish Hatchery for use of laboratory space. March 20: Secured permission from Japanese authorities for travel to Japan and inspection of herring culture facilities and techniques. Coordination for travel to Japan has been through Dr. Koji Nakamura, Fisheries Research Agency, Yokohama, and Dr. Matsubara, Hokkaido Kushiro Fisheries Experimental Station. March 23: Completion of laboratory infrastructure (tanks, water system, larva feed development system) for herring culture. March 29: Travel plans confirmed for PI to tour Japanese herring facilities in April, 2007. March 31: Anticipate obtaining herring spawn from Prince William Sound to initiate pilot scale study as basis for expanded program if future funding is awarded.

3rd Quarter Tasks (April 1, 2007 - June 30, 2007)
Status: Complete

Tasks to be performed:

April: Travel to Japan. Collect eggs, start larval culture #1

Progress report:

April: PI and Co-PI continued drafting task and narrative contributions for the herring restoration plan. April: PI traveled to PWS and successfully captured mature herring. These herring were stripped of gametes. Spawn on kelp was also harvested. Both gametes and spawn on kelp were taken to Seward. April: Gametes were used to evaluate salinity tolerance range. Gametes were fertilized, applied to glass plates and suspended in 3 tanks for incubation which were set for 8, 16 and 32 ppt salinity. On a weekly basis, plates were removed from tanks and a sub-sample of eggs taken for histology and to document development. April: Spawn on kelp was placed into a tank for incubation. Every 2nd to 3rd day until hatching, a sub-sample of eggs was removed for histology and to document development. Hatching began on April 21 and ended on April 23, 2007. Approximately 5,400 larvae were moved into 6 tanks. Tanks were split into 3 trial groups: “Fed, Delayed Feeding and Not Fed.” April: Rotifer culture was initiated supported by larviculture experts from Virginia Tech Aquaculture, to begin grow out of food source for larval herring. Rotifers were introduced to herring on April 24, 2007. April PI traveled to Japan to work with herring culture specialists at the Hokkaido Kushiro Fisheries Experimental Station to learn culture techniques with consideration for application or adaptation to herring culture in Alaska. May: Hatching began in salinity tolerance trial. Survival rates determined for the different salinities. Intermediate salinity (16 ppt) produced the highest survival to hatch, whereas low (8 ppt) and high (32 ppt) resulted in lower hatching success. May: Started Artemia culture. Introduced Artemia to larvae from spawn on kelp on May 8; feeding both rotifers and Artemia. Between May 8 and May 19, slowly transitioned larvae from rotifer diet to Artemia diet. May: By May 12 all larvae in the “Not Fed” group had died. May: Started introducing small amount of dry feed to feeding regime without decreasing Artemia amounts. June: By June 17 only 3 larvae were still alive in the “Delayed Feeding” group. Larvae were sampled for histology. June: On June 20 continued dry feed introduction but began reducing the amounts of Artemia as feed. June: June 25 trial was ended. Only 6 larvae remained in the “Fed” group.

4th Quarter Tasks (July 1, 2007 - September 30, 2007)
Status: Complete

Tasks to be performed:

Complete assessment of Japanese culture techniques. Submit annual report

Progress report:

Completed assessment of Japanese culture techniques. Progress report was accepted as annual report.

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