Washington i-31-R Clyde Sayce Completed 1968 



Willapa oyster studies - The growth and fatness of Pacific oysters ^i"© studied at the Shell- 

 fish Laboratory, Nahcotta. Supplemental feeding with starch and materials containing starch, 

 such as powdered milk and egg products, and fish protein concentrate was provided to determine 

 how it affected the fatness and pumping rate of the Pacific oyster. Hydrographic factors 

 that directly affect the retention of oyster larvae to setting size are being defined to 

 provide the industry with improved prediction of commercial spatfall. 



Washington l-/>3-R Ronald Westley |12,800 



Oyster drill(Ocinebra japonica) control - The behavior patterns of Japanese oyster drills 

 and egg cases, and control measures are the main purposes of this study at the Point 

 Whitney Shellfish Laboratory, Brinnon. Investigations in the laboratory and In the field 

 indicate that the male drills are attracted to a water-borne substance released by the female. 

 Further work is underway to define this substance. The testing of chemicals to control the 

 drill is continuing. 



Shrimp : 



Alaska 5-9-R Peter B. Jackson and Jerry A. McCrary $37,900 



Investigation of ecological factors limiting production of the Alaska Pandalid shrimp - 

 Data have been collected in southeastern Alaska for determination of age and growth, length- 

 weight relation, sex changes, and ovlgerous period of the pink and the side-striped shrimps; 

 similar, but not as extensive, data have been collected for the humpy and spot shrimps. 

 Life history studies of these shrimp species in the Kodlak area are continued. 



Georgia 2-4-3-R Charles M. Frlsble $37,8^0 



Seasonal abundance and biological stability of the commercial shrimp of Georgia - Sampling 

 stations are located offshore in sounds, rivers, and in marshes throughout the shrimp's 

 habitat. Trawl, seine, and plankton net collect adults, postlarval, and larval shrimp 

 throughout the year. Determinations are made on relative and seasonal abundance, 

 growth rate, sex ratio, spawning success, and limiting environmental factors of shrimp. 



Hawaii H-l-D Takujl Fujlmuru $18,800 



Development of a prawn fishery - Laboratory findings indicate that the prawn, Macro brachium 

 rosenbergi, can be held successfully for an indefinite period in tanks . The 

 species will reproduce in captivity, and the larval stages can survive in the labo- 

 ratory. Work is in progress on the selection, introduction, and establishment of prawns 

 suitable for mass culture and the development of culturing techniques that will lead to 

 a commercial prawn-raising industry. The research is -at the Keehi Fishery Station, 

 Division of Fish and Game, Honolulu. 



Maine 3-12-R Ronald G. Rinaldo $26,000 



Northern shrimp - biological and technical research - Studies are underway on waters adjacent 

 to the Maine coast to determine the relative abundance of species of northern shrimp, par- 

 ticularly Pandalus borealis, and life history and seasonal availability of the several species. 

 Technical problems associated with economical and efficient harvesting and marketing these 

 species are also investigated. 



North Carolina 2-26-R Edward G. McCoy $32,816 



Shrimp studies - Information was obtained on population dynamics. Including migratory be- 

 havior, for pink, brown, and white shrimp marked with biological stains and fluorescent 

 pigments and released in nursery areas tributary to Core Sound and Lower Cape Fear River 

 estuaries. A combined total of 26,989 shrimps was marked and released, of 



which 1,671, or 6.2 percent, were recaptured. Mark and recapture studies on brown shrimp are 

 continuing In Pamlico Sound and Bogue Sound estuaries, including Newport River. 



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