of Foreign Trade and Economic Sei-vices, Bu- 

 reau of Commercial Fisheries. April 1968 

 (revised), v + 12 pp. 



ABSTRACT 

 One hundred and eight fishermen's and fish shore 

 workers' unions in 19 States are listed. 



Special Scientific Report-Fisheries 



559. Water quality of streams tributary to 

 Lakes Su])erior and Michigan, by Jerome W. 

 Zimmerman. January 1968, iii + 41 pp., 2 

 figs., 11 tables, 1 app. 



ABSTRACT 



Water quality of streams tributary to Lakes Su- 

 perior and Michigan was analyzed for 142 stations 

 on 99 streams tributary to Lake Superior and 83 

 stations on 56 streams tributary to Lake Michigan 

 during 1962-65. 



Concentrations of aluminum, copper, and iron 

 were not affected greatly by flow or season. Mag- 

 nesium, calcium, chlorides, total alkalinity, total 

 hardness, and conductivity varied with the flow, tem- 

 perature, and season; the lowest values were dur- 

 ing the spring runoff and heavy rains, and the high- 

 est were during low water in late summer and the 

 colder periods of winter. Concentrations of nitrate, 

 silica, and sulfates were lowest in the spring and 

 summer. Concentrations of tanninlike and lignin- 

 like compounds were highest during the spring run- 

 off and other high-water periods, and were lowest 

 during freezeup when surface runoff was minimal. 

 The pH values were highest from June to Sep- 

 tember and lowest during the spring runoff. Phenol- 

 phthalein alkalinity was detected primarily in the 

 summer and coincided occasionally with low flows 

 just before the spring thaw. Total hardness usually 

 was lower in streams tributary to Lake Superior 

 than in streams tributary to Lake Michigan. The 

 total hardness was higher in the streams in Wis- 

 consin than in the streams in Michigan along the 

 west shore of Lake Michigan. It was lowest in 

 the northernmost streams. 



The water quality of the streams in an area was 

 related to the geological characteristics of the land. 



560. Published in 1967. 



561. Diel and seasonal occurrence of pink 

 shrimp, Penaeus duorarum Burkenroad, in 

 two divergent habitats of Tampa Bay, Florida, 

 by Carl H. Saloman. January 1968, iii + 6pp., 

 4 figs., 6 tables. 



ABSTRACT 

 Pink shrimp, Penaeus duoranim, were sampled 

 for 17 months in two divergent habitats in Tampa 

 Bay, Fla. Information was obtained on size and 

 sex of the shrimp, water temperature, salinity, light 

 transmission, and activity in relation to moon phase. 



Catches were larger during darkness and rose as 

 temperature decreased from about 30° C to 14° C. 

 Larger shrimp were caught in darkness than in day- 

 light throughout the period. Larger shrimp were 

 also caught at the station having lowest salinity 

 and incidence of transmitted light. In dark phases 

 of the moon greater numbers of shrimp were caught 

 than during light phases. The size of shrimp 

 reached a peak in April and May after an average 

 increase in length of about 1 mm carapace length 

 per month. Female shrimp were larger than males 

 in all samples except two. 



562. Seasonal and areal distribution of zoo- 

 plankton in coastal waters of the Gulf of 

 Maine, 1965 and 1966, by Kenneth Sherman. 

 March 1968, iii + 11 pp., 6 figs., 6 tables. 



ABSTRACT 

 A description is given of the abundance, compo- 

 sition, and seasonal variations in distribution of 

 zooplankton. Eleven major taxa were represented 

 in the samples. Six were holoplanktonic, and five 

 were meroplanktonic. Copepods were the dominant 

 zooplankters during all seasons in both years. Zoo- 

 plankton volumes in both years followed similar 

 areal trends. Mean annual volumes were highest 

 in the western area (Cape Ann to Cape Elizabeth), 

 moderate in the central area (Cape Elizabeth to 

 Mt. Desert Island), and low in the eastern sector 

 (Mt. Desert Island to Machias Bay). Zooplankton 

 volumes were generally lower in 1966 than in 1965. 

 Areal and annual variations in the abundance of 

 zooplankters are discussed in relation to hydro- 

 graphy. 



563. Bibliography of oyster parasites and di- 

 seases, by Carl J. Sindermann. April 1968, 

 13 pp. 



ABSTRACT 

 The bibliography is oriented toward the diseases 

 that affect oysters and is not concerned with human 

 diseases that may be transmitted by raw shellfish. 

 References to parasites and diseases of pearl oysters 

 (Pteriidae) have been included, even though such 

 bivalves are not true oysters (Ostreidae). Refer- 

 ences to mortalities of oysters have been included 

 only if a pathogen was associated or suspected. 

 Particular emphasis has been placed on disease 

 states resulting from an infectious agent or para- 

 site invasion. 



564. Description and evaluation of methods for 

 determining incident solar radiation, subma- 

 rine daylight, chlorophyll «, and primary pro- 

 duction — Used by Scripps Tuna Oceanogra- 

 phy Research Program in the eastern tropical 

 Pacific, by Robert W. Holmes . December 

 1968, iii -t- 31 pp., 5 figs., 15 tables. 



