604. The Flora and Fauna of a Basin in Central 

 Florida Bay. By J. Harold Hudson, Donald 

 M. Allen, and T. J. Costello. May 1970. iii + 

 14 pp., 2 figs., 1 table. 



ABSTRACT 

 One hundred ninety-six species of plants and 

 animals are reported from a nursery area for pink 

 shrimp, Petiaeus ditoranini (iKoranini, in a basin 

 of central Florida Bay. Many of the organisms are 

 benthic and associated with shallow beds of turtle 

 grass, Tlialassia testHtlhiKin. Although abi-upt 

 habitat variations may affect species distribution, 

 the general distribution of organisms in the basin 

 and bay defines environments influenced by different 

 water masses. 



605. Contributions to the Life Histories of 

 Several Penaeid Shrimps (Penaeidae) along 

 the South Atlantic Coast of the United States. 

 By William W. Anderson. May 1970, iii + 

 24 pp., 15 figs., 12 tables. 



ABSTRACT 

 Shrimp, the most valuable fishery resource of the 

 south Atlantic coast of the United States, contribut- 

 ed about 40 percent of the $27 million exvessel 

 value of all fishery landings in the area in 1966. 

 Three species of shallow-water penaeid shrimps are 

 of greatest commercial importance: white shrimp, 

 Penaeus setiferus; brown shrimp, P. azteciis; and 

 pink shrimp, P. duoraridii. The shrimp fishery is 

 reviewed for trends in yield for the area as a unit, 

 by States, and by species, for the 10-year period 

 1958-67. A trend toward steady decline in total 

 shrimp landings is indicated. During studies on the 

 white shrimp along the south Atlantic coast of the 

 United States in 1931-35, data were obtained on the 

 brown shrimp; the sea bob, XiphopetieKS kroyeri; 

 and Trachypeneus constrictus. Observations were 

 also made on the pink shrimp from operations of 

 the Bureau of Commercial Fisheries RA' Oregon 

 of northeast Florida near Cape Kennedy in 196.5-67. 

 This report presents size distribution, ovary de- 

 velopment, and sex ratios of the several species 

 of shrimp, and includes limited information on 

 spawning season. 



606. Annotated References on the Pacific Saury, 

 Cololabis saira. By Steven E. Hughes. June 

 1970, iii + 12 pp. 



ABSTRACT 

 The pertinent literature on the saury is reviewed, 

 because of the recent interest in developing a 

 fishery for this species along the west coast of the 

 United States. Over three-fourths of the 72 refer- 

 ences concern Japanese or So\iet reports on their 

 saury stocks and fishing industries. The annotations 

 briefly describe the nature of the research and 

 summarize the important results or conclusions. 

 A subject-author index is provided. 



607. Studies on Continuous Transmission Fre- 

 quency Modulated Sonar. By Frank J. Hester. 

 June 1970, iii + 26 pp. 1st paper. Sonar 

 Target Classification Experiments with a 

 Continuous-Transmission Doppler Sonar. By 

 Frank J. Hester, pp. 1-20, 14 figs., 4 tables. 



ABSTRACT 

 A continuous-transmission sonar with very fine 

 echo frequency discrimination was designed and 

 constructed to study Doppler effects caused by the 

 motion of fish as they relate to fish size and swim- 

 ming characteristics. Although the equipment per- 

 formed as theory predicted, difficulties with sea 

 noise and trouble in maintaining contact with fish 

 schools showed that commercial application of this 

 approach is unsuitable without considerable ad- 

 ditional development work. These problems and 

 some results are discussed, and notes on target- 

 strength measurements of several species of fishes 

 are included in this report. 



(607.) Studies on Continuous Transmission 

 Frequency Modulated Sonar. By Frank J. 

 Hester. June 1970, iii -I- 26 pp. 2nd paper. 

 Acoustic Target Strength of Several Species 

 of Fish. By H. W. Volberg. June 1970, pp. 21- 

 26, 10 figs. 



ABSTRACT 

 To design fish-finding sonar equipment it is neces- 

 sary to have information about target strengths of 

 fish. This study was made principally to determine 

 the target strength of tunas at several acoustic 

 frequencies. In addition, measurements were made 

 on other living, dead, fresh, and frozen fresh-water 

 and salt-water fishes, some without swim bladders. 



608. Preliminary Designs of Traveling Screens 

 to Collect Juvenile Fish. 1st paper, Traveling 

 Screens for Collection of Juvenile Salmon 

 (Models I and II). By Daniel W. Bates and 

 John G. Vanderwalker. July 1970, v + 1-5 



pp., 6 figs., 1 table. 



ABSTRACT 

 Two horizontal traveling screens were designed 

 and operated for 2 years at the Carson National 

 Fish Hatchery, Carson, Wash. Deflection efficiencies 

 were 100 percent in 37 tests of over 11,000 juvenile 

 coho, Oiicorhynchus kisutch, and chinook salmon, 

 O. tshawytscha. The screens demonstrated their 

 potential capacity to divert young salmon moving 

 upstream. 



(608.) Preliminary Designs of Traveling 

 Screens to Collect Juvenile Fish. July 1970, 

 V -I- 15 pp. 2nd paper. Design and Operation 

 of a Cantilevered Traveling Fish Screen 

 (Model V). By Daniel W. Bates, Ernest W. 

 Murphey, and Earl F. Prentice, pp. 6-15, 



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