No. Title 



504. Studies of the early life history of Atlantic menhaden in estuarine 

 nurseries. Part l--Seasonal occurrence of juvenile menhaden and 

 other small fishes in a tributary creek of Indian River, Delaware , 

 1957-58. By Anthony L. Pacheco and George C. Grant. April 

 1965, iii + 32 pp. , 6 figs. , 7 tables. 



505. Spiny lobster explorations in the Pacific and Caribbean waters 



of the Republic of Panama. By Johnny A. Butler and Norman L. 

 Pease. July 1965, iv + 26 pp., 32 figs., 1 table. 



506. Table of sigma-t with intervals of 0. 1 for temperature and salinity. 

 By Betty Ann L. Keala. April 1965, i + 186 pp. 



507. A preliminary bibliography with KWIC Index on the ecology of 

 estuaries and coastal areas of the eastern United States. By 

 Robert Livingstone, Jr. May 1965, iii + 352 pp. [ SSR-F 507 is 

 for sale by the Superintendent of Documents, U.S. Government 

 Printing Office, Washington, D. C. 20402; the price is $1. 75. ] 



508. Seasonal gonadal cycle of the male soft- shell clam, My a arenaria, 

 in Maryland. By William N. Shaw. February 1965, iii + 5 pp. , 

 8 figs. 



509. Laboratory evaluation of the l-on-10 slope Ice Harbor fishway 

 design. By Clark S. Thompson and Joseph R. Gauley. June 1965, 

 iii + 20 pp. , 18 figs. , 10 tables. 



510. Collections by the exploratory fishing vessels Oregon, Silver Bay, 

 Combat, and Pelican made during 1956 to I960 in the southwestern 

 North Atlantic. By Harvey R. Bullis , Jr. , and John R. Thompson. 

 August 1965, iii + 130 pp. , 4 tables. 



511. Evaluation of biological stains, inks, and fluorescent pigments as 

 marks for shrimp. By Edward F. Klima. May 1965, iii + 8 pp. , 

 1 fig. , 5 tables. 



512. Hypotheses on the origin of exploited skipjack tuna (Katsuwonus 

 pelamis) in the eastern and central Pacific Ocean. By Brian 

 J. Rothschild. April 1965, iii + 20 pp. , 19 figs., 1 table. 



513. Comparison of vertebral counts of Atlantic menhaden. By Fred C. 

 June. June 1965, iii + 12 pp. , 2 figs. , 5 tables. 



514. Biological- statistical census of the species entering fisheries in 

 the Cape Canaveral area. By William W. Anderson and Jack W. 

 Gehringer. July 1965, x + 79 pp., 15 figs., 64 tables. 



515. Annual fish passage report - Rock Island Dam, Columbia River, 

 Washington, 1964. By Paul D. Zimmer and John H. Broughton. 

 April 1965, iii + 23 pp. , 3 figs. , 21 tables. 



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