the rehabilitation and management of the fishery, 

 such as artificial propaRation, installation of fish- 

 passage facilities at impoundments, and fishing reg- 

 ulations. 



With our present knowledge, we can manage in- 

 dividual shad populations; but, we probably cannot 

 restore the shad to its former peak of abundance. 



551. Preliminary report on the feedin? habits 

 of tunas in the Gulf of Guinea. By Paul N. 

 Sund and William J. Richards. July 1967, iii 

 4- 6 pp., 1 fig, 2 tables. 



ABSTR.ACT 

 The stomachs of 171 yellowfin tuna (Thunnus al- 

 bacares) and 72 skipjack tuna {Katsuwonus pela- 

 mix), captured in the Gulf of Guinea, contained 

 mostly fishes, cephalopods, and crustaceans. The 

 percentage composition by volume of these three 

 food categories was: 55, 19, and 8 for yellowfin 

 tuna; 96, 1, and 2 for skipjack tuna. The percentage 

 frequency of occurrence was: 76, 40, and 53 for 

 yellowfin tuna; 73, 14, and 22 for skipjack tuna. 

 The occurrence of forage species varied little in 

 geographic areas within the region, but differences 

 did occur between the food species found in stomachs 

 of fish captured in the "warm" and "cool" seasons. 

 A trematode parasite of the genus Hirudhiella was 

 found in stomachs of both tuna species. 



552. The Trade Wind Zone Oceanoofraphy Pilot 

 Study Part 1: Toirnsend Cromwell cruises 

 1, 2, and 3 February to April 1964. By Robert 

 L. Charnell, David W. K. Au, and Gunter R. 

 Seckel. June 1967, v + 75 pp., 28 figs., 3 

 tables. 



ABSTRACT 

 A standard grid of oceanographic stations in an 

 area bounded by lat. 10° and 26° N., and long. 148° 

 and 157° W., was occupied at monthly intervals be- 

 tween February 1964 and .June 1965. For the first 

 set of three cruises, Townxevd Cromwell cruises 1, 

 2, and 3, February to April 1964, oceanographic 

 station data are tabulated, BT data are presented 

 in vertical sections, and the distribution of surface 

 temperature, surface salinity, and surface dynamic 

 height relative to 1,000 m. (cruise 1), and 1,200 m. 

 (cruises 2 and 3) are shown in charts for each 

 cruise. Methods and procedures as well as the lim- 

 itations of the (lata are discussed. 



553. The Trade Wind Zone Oceanography Pilot 

 Study Part II: Townsend Cromwell cruises 

 4, 5, and 6 May to July 1964. By Robert L. 

 Charnell, David W. K. Au, and Gunter R. 

 Seckel. June 1967, v -f 78 pp., 28 figs., 3 

 tables. 



ABSTRACT 

 A standard grid of oceanographic stations in an 

 area bounded by lat. 10° and 26° N., and long. 148° 



and 157° W., was occupied at monthly intervals be- 

 tween February 1964 and June 1965. For the sec- 

 ond set of three crui.ses, Tounsend Cromwell cruises 

 4, 5, and 6, May to July 1964, oceanographic station 

 data are tabulated, BT data are presented in vertical 

 sections, and the distribution of surface temperature, 

 surface salinity, and surface dynamic height rel- 

 ative to 1,200 m. are shown in charts for each cruise. 

 Methods and procedures as well as the limitations 

 of the data are discussed. 



.554. The Trade Wind Zone Oceanography Pilot 

 Study Part III: Townsend Cromwell cruises 

 8, 9, and 10 September to November 1964. 

 By Robert L. Charnell, David W. K. Au, and 

 Gunter R. Seckel. June 1967, v + 78 pp., 28 

 figs., 3 tables. 



ABSTRACT 

 A standard grid of oceanographic stations in an 

 area bounded by lat. 10° and 26° N., and long. 148° 

 and 157° W., was occupied at monthly intervals be- 

 tween February 1964 and June 1965. For the third 

 set of three cruises, Townsend Cromwell cruises 8, 

 9, and 10, September to November 1964, oceano- 

 graphic station data are tabulated, BT data are 

 presented in vertical sections, and the distribution 

 of surface temperature, surface salinity, and surface 

 dynamic height relative to 1,200 m. for cruises 8 and 

 9 and 1,000 m. for cruise 10. Methods and proce- 

 dures as well as the limitations of the data are dis- 

 cussed. 



555. The Trade Wind Zone Oceanography Pilot 

 Study Part IV: Townsend Cromwell cruises 

 11, 12, and 13 December 1964 to February 

 1965. By Robert L. Charnell, David W. K. Au, 

 and Gunter R. Seckel. June 1967, v + 78 pp., 

 28 figs., 3 tables. 



ABSTRACT 

 A standard grid of oceanographic stations in an 

 area bounded by lat. 10° and 26° N., and long. 148° 

 and 157° W., was occupied at monthly intervals 

 between February 1964 and June 1965. For the 

 fourth set of three cruises, Townsend Cromwel! 

 cruises 11, 12, and 13, December 1964 to February 

 1965, oceanographic station data are tabulated, BT 

 data are presented in vertical sections, and the dis- 

 tribution of surface temperature, surface salinity, 

 and surface dynamic height relative to 1,200 m. are 

 shown in charts for each cruise. Methods and pro- 

 cedures as well as the limitations of the data are 

 discussed. 



556. The Trade Wind Zone Oceanogra])hy Pilot 

 Study Part V: Townsend Cromwell cruises 

 14 and 15 March and April 1965. By Robert 

 L. Charnell, David W. K. Au, and Gunter R. 

 Seckel. June 1967, v -f 54 pp., 19 figs., 2 

 tables. 



10 



