vival of their progeny. By William J. McNeil. 



September 1966, iii + 12 pp., 1 fig-., 13 tables. 

 ABSTRACT 

 The escapement of pink salmon (Oncorhynchus 

 gorbiischn) to Sashin Creek, southeastern Alaska, 

 in 196S was 16,757 fish, and fresh-water survival 

 calculated from potential egg deposition and num- 

 ber of outmigrant fry was 20 percent. The spawn- 

 ing ground was divided into three areas — upper, 

 middle, and lower — for the study of density of 

 spawners and survival of progeny. The density of 

 spawners was highest in the middle area. Survival 

 during spawning was low in each area ; survival 

 between the end of spawning and the beginning of 

 fry emergence was variable among the three areas; 

 and survival during fry emergence was high in each 

 area. From egg deposition to fry emergence, sur- 

 vival was estimated to be 31 percent in the upper 

 area, 16 percent in the middle area, and 15 percent 

 in the lower area. 



Although the upper area was highly productive 

 of pink salmon fry, it has had intensive spawning 

 only in years when the density of spawners was 

 high. When the density was low, spawners tended 

 to concentrate in the lower area. The validity of 

 the supposition that only highly productive spawn- 

 ing beds are used when escapements are small is 

 questioned. The observations at Sashin Creek indi- 

 cate that relatively large escapements help ensure 

 complete use of productive spawning beds. 



539. Tagging: summary of American shad, 

 Alosa sapidissima (Wilson) and striped bass, 

 Roccvs saxatilis (Walbaum), Bureau of Com- 

 mercial Fisheries Biological Laboratory, 

 Beaufort, N.C., 1950-65. By Paul R. Nichols 

 and Randall P. Cheek. July 1966, 8 pp., 1 fig., 

 6 tables. 



ABSTRACT 

 Number and tj^De of tags applied on American 

 shad, Alosa sapidissima (Wilson), and striped bass, 

 Roccus sajcatilis (Walbaum), in 1950-65, are sum- 

 marized in tables. A detailed description is given of 

 each type of tag and how it was affixed to the fish. 

 The report also gives the purpose of each tagging 

 study and the status of reports on the findings. 



540. Biological oceanography of the eastern 

 tror)ical Pacific: Summary of existing infor- 

 mation. By Maurice Blackburn. November 

 1966, iii -f 18 pp., 6 figs.. 2 tables. 



ABSTRACT 

 Investigations of the biological oceanography of 

 the eastern tropical Pacific are reviewed. Published 

 papers, papers in press, and completed manuscripts, 

 are briefly summarized. On most of the 29 biologi- 

 cal-oceanographic expeditions made since 1952, sim- 

 ilar properties were measured by similar methods. 

 Numbers of available comparable measurements 



are: standing crop of surface chlorophyll a, 1,153; 

 surface primary productivity, 603 ; standing crop 

 of small zooplankton in the upper 300 m., 875; 

 standing crops of chlorophyll a and micronekton in 

 the upper 100 m., about 100 each; other types of 

 measurements, small numbers. 



The measurements of surface chlorophyll a, sur- 

 face productivity, and zooplankton are analyzed by 

 14 areas which are distinguished on the basis of the 

 physical structure of the upper 200 m. and by half- 

 yearly periods irrespective of year. The analysis by 

 areas shows that all three measurements are highest 

 in upwelling areas (coastal and equatorial) and 

 areas with thin mixed layers, lowest in areas with 

 thick mixed layers (in the subtropical anticyclonic 

 current gyrals), and intermediate elsewhere. The 

 analysis by periods is partly inconclusive because 

 of the uneven distribution of observations through 

 the year. The most interesting result is the unex- 

 pected lack of statistically significant differences be- 

 tween property means for the 2 half-years in some 

 of the areas which are believed (on physical-ocean- 

 ographic grounds) to be seasonally eutrophic. 



The paper also summarizes findings reported else- 

 where on changes in biological properties with depth 

 and time of day and on successive days. Past 

 studies on statistical relationships between differ- 

 ent properties measured at the same times and 

 places and on the ecology of special groups of or- 

 ganisms (especially chaetognaths, considered as pos- 

 sible "indicators" of water masses or property-dis- 

 tributions) are also summarized briefly. Numerous 

 deficiencies of knowledge are evident; increased re- 

 search could contribute fundamentally to the much 

 neglected study of biological oceanography in the 

 tropical oceans of the world. 



541. Distribution and occurrence of Gymnodin- 

 ium breve on the west coast of Florida, 1964- 

 65. By Alexander Dragovich and John A. 

 Kelly, Jr. December 1966, iii + 15 pp., 7 figs., 

 4 tables. 



ABSTRACT 

 The distribution and monthly occurrence of Gym- 

 nodiiiium breve, the Florida red-tide organism, were 

 determined over a period of 13 months (in 1964-65) 

 in the coastal waters of west Florida. Counts of 

 G. breve varied from to 53,800 cells per liter of 

 water; no fish kills were observed. The organism 

 was present at all stations from 9.3 km. (5 miles) 

 to 37.1 km. (20 miles) offshore. It was not present 

 in samples from Tampa Bay, and it was found only 

 twice in samples from Charlotte Harbor. The high- 

 est occurrence of G. breve was in samples taken 

 27.8 km. (15 miles) offshore. Vertical distribution 

 of the species was greatest at the surface and at 

 5 m. and lowest at 20 m. The largest concentrations 

 of G. breve occurred in September during a period 

 of reduced salinity and temperature. Because these 

 two factors are important to the ecologry of the or- 

 ganism, their relation to the presence or absence 



