neth H. Mosher. August 1969, iii + 17 pp., 



23 figs. 



ABSTRACT 

 Descriptions and illustrations of the scales of each 

 species, a key to identifying species by use of scale 

 characters, and a section on the appearance of ju- 

 venile salmon scales are presented. 



318. Bottom trawl explorations in northern 

 Lake Michigan, 1963-6.5, by Norman J. Reigle, 

 Jr. September 1969. iii + 21 pp., 6 figs., 11 

 tables, 5 app. tables. 



ABSTRACT 



Over a period of 3 years the Bureau of Commer- 

 cial Fisheries Exploratory Fishing Base at Ann 

 Arbor, Mich., surveyed the relative abundance, depth 

 distribution, and seasonal availability of various fish 

 stocks that were fished with bottom trawls. 



The alewife, Alosa pseudoharengus, and chubs, 

 Leucichthys spp., were taken readily with the bot- 

 tom trawl. Alewives composed 48 percent and chubs 

 42 percent of the total trawl catch. Three other 

 fish — smelt, Osmerus mordox, suckers, Catostormis 

 conimersoni and C. catostomus, and common white- 

 fish, Coregonus clupeaformis — were taken occasion- 

 ally in commercial amounts. 



Alewives have very pronounced seasonal move- 

 ments, and at certain times of the year bottom trawls 

 catch them only at specific depths. Bottom trawls 

 did not take alewives in commercial amounts during 

 all periods fished; there is evidence that alewives 

 would be available commercially only in certain 

 seasons. Chubs were caught readily throughout the 

 study, although they too appeared to be taken in 

 greater quantities at certain times. Bottom trawling 

 indicated some horizontal dispersal of both alewife 

 and chubs shoreward in summer and back to deeper 

 water in fall. Chubs are caught over a wide depth 

 range throughout the year. 



319. Published in 1970. 



320. Synopsis of biological data on the Atlantic 

 menhaden, Brevoortln tyra)inus, by John W. 

 Reintjes. November 1969, iii + 30 pp., 7 figs., 

 12 tables. 



ABSTRACT 

 This review of the biology of Atlantic menhaden 

 includes taxonomy, morphology, distribution, repro- 

 duction, life history, growth, behavior, and abun- 

 dance. Also included are: data on the size, age, 

 and sex composition of the commercial catch; esti- 

 mates of relative abundance; and a description of 

 fishing methods and equipment. 



321. Progress in 1967-68 at the Bureau of Com- 

 mercial Fisheries Biological Laboratory, Hon- 

 olulu, by Thomas A. Manar. September 1969, 

 ii + 39 pp., 23 figs. 



ABSTRACT 

 This report deals with research results achieved 

 by the Bureau of Commercial Fisheries Biological 

 Laboratory in Honolulu from January 1, 1967 to 

 June 30, 1968. Described are projects designed to 

 improve the efliciency of the Hawaiian fleet for skip- 

 jack tuna; work in immunogenetic analysis that is 

 clarifying the relations of the skipjack tuna sub- 

 populations of the Pacific Ocean; investigation of 

 the shrimp and bottom fish resources of Hawaii; 

 advances in oceanographic research, including dis- 

 covery of a wake in the lee of Johnston Island, as 

 predicted by theory; the effects of oil spillage on 

 a Pacific island; and the first scientific review of 

 the international CSK (Cooperative Study of the 

 Kuroshio and Adjacent Regions). Publications for 

 the period are listed. 



322. Bureau of Commercial Fisheries Federal 

 Aid Program Activities 1969, by Division of 

 Federal Aid Staff. July 1969, iv + 76 pp. 



(No abstract.) 



323. Vertical sections of temperature and sa- 

 linity in the trade wind zone of the central 

 North Pacific, February 1964 to June 1965, 

 by Gunter R. Seckel. October 1969, ii + 11 

 pp., 5 figs., 16 append, figs. 



ABSTRACT 

 Temperature and salinity data obtained between 

 lat. 10° and 26° N., along the four meridians long. 

 148°, 151°, 154°, and 157° W. are presented in 

 vertical sections for 16 monthly cruises of the Trade 

 Wind Zone Oceanography Pilot Study. The sections 

 can be used in planning applied oceanography ex- 

 periments, exploratory cruises in marine biology and 

 fisheries, or in fishery extension work. The text 

 will aid those who are not familiar with the central 

 North Pacific or who are not specialists in ocean- 

 ography. 



324. Bureau of Commercial Fisheries Biologi- 

 cal Laboratory Oxford, Maryland. November 

 1 969. Four-fan fold. 



(No abstract.) 



325. Report of the Bureau of Commercial Fish- 

 eries Biological Laboratory, Galveston, Texas, 

 Fiscal Year 1968, by Milton J. Lindner, Di- 

 rector and Robert E. Stevenson, Assistant Di- 

 rector. October 1969, iii -|- 32 pp., 20 figs., 

 14 tables. 



ABSTRACT 



Progress of research is reported. Emphasis is 

 on shrimp, and the research involves the fields of 

 biology, population dynamics, ecology, and ocean- 

 ography. 



