HAWAII (Cont. ) 



Life History and Biology of Tunas. 



In order to better understand the occurrence, distribution and abundance of 

 tunas of various sizes, this is a study of the spawning, maturation, early life 

 history, and age and growth of the tunas found in the equatorial Pacific. 



Hdqrs. Honolulu; began 1948, continuing; D. J. McKernan, Leader. 



Address inquiries to: O. E. Sette, as in No. 1 above. 



PUERTO RICO 

 Division of Forests, Fisheries and Wildlife 



1. Fish Survey and Investigations. (FA: F-l-R) 



Objectives of the project are to obtain basic information on lake fish popu- 

 lations, trends and rate of harvest on which to base a comprehensive fish man- 

 agement program to insure to the public the greatest possible returns in recrea- 

 tional and food values, consistent with a sustained yield. Every other 15 days, 

 for a period of a year, fish census personnel stationed at Lakes Dos Bocas, 

 Caonillas and Guajataca contact fishermen and sportsmen visiting those waters 

 and take records of the catch, number of hours fished, type of bait and fishing 

 methods employed. 



Using rotenone, periodic fish population samples are taken in selected coves 

 on Lakes Dos Bocas, Guajataca and Caonillas. Fish collected are sorted by species 

 and size groups; and proportion of forage to game fish determined. Fish stomachs 

 are examined to determine food preferences of the different fish species. 



Lakes Dos Bocas, Guajataca and Caonillas; began October 1952, to close 

 June 1954; $11,989; Luis A. Costas Grana, Leader; reports available. 



Address inquiries to: B. Quinones Chacon, Departnnent of Agriculture and 

 Commerce, P. O. Box 488, Rio Piedras, Puerto Rico. 



2. Puerto Rico Fish Survey and Investigations. 



The objective of the project is to develop good fishing, in quality and quantity, 

 in the new impoundments constructed on the Island. Since the native stream fish 

 fauna does' not thrive well in impounded waters and practically all the species spawn 

 in the sea, it is necessary to stock these lakes with fresh warm-water exotics as 

 bass and bluegill which have proved so successful in other lakes of the Island. 

 Lakes Luchetti and Loiza with a surface area of 1,198 acres were recently 

 completed and stocked with bass and bluegill fingerlings produced at the Maricao 

 Fish Hatchery. Field observations are being made to determine survival of 

 fingerlings, rate of growth, and reproduction. Creel censuses will be conducted 

 to ascertain rate of harvest and the composition and structure of the catch. 



Lakes Loiza, Luchetti, Guayo, Loco, Yahuecas and Prieto; began August 1953, 

 indefinite; $7,000; Felix Inigo, Leader. 



Address inquiries to: B. Quinones Chacon, as in No. 1 above. 



3. Water Hyacinth Control on Dos Bocas Lake and Cano Tiburones. (FA: FW-l-D)* 



Objective of the project is to eradicate the water hyacinth from 500 acres 

 of water in Cano Tiburones, and to eliminate the large floating mats now exist- 

 ing on Dos Bocas, through spraying with 2, 4-D. 



Began August 1953, indefinite; $4,582; Luis A. Costas Grana, Leader. 



Address inquiries to: B. Quinones Chacon, as in No. 1 above. 



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