August 19G6 



COMMERCIAL FISHERIES REVIEW 



21 



was exhibited by all specimens, measuring 

 as much as 24 millimeters (almost 1 inch). 

 With the exception of 3 large old-shell adults, 

 abalone shell growth appeared quite uniform. 



Stainless steel tags were fixed through the 

 respiratory pores of 268 red abalone. Tagged 

 abalone were replaced at the diving sites. 



Exceptionally dense beds of bull kelp(Ne- 

 reocystis luetkeana ), were developing through- 

 out the survey area. Some of this year's spo- 

 rophytes already extended to the surface from 

 40-foot depths, although the majority of plants 

 were from 8 to 20 feet long. 



Fish species com^mon to most rocky bot- 

 tom stations were blue rockfish ( Sebastodes 

 mystinus), black rockfish (S. melanops ), kelp 

 rockfish (S. atrovirens ), cabezon ( Scorpaen- 

 ichthys marmoratus ), and kelp greenling 

 (Hexagrammos decagrammus ). Dominant 

 sand bottom invertebrates were the snail 

 ( Olivella biplicata ), and the sand dollar ( Den - 

 draster excentricus) . 



A large school of basking sharks ( Cetor - 

 hinus maximus) was sighted off Point Estero 

 on June 5, moving in a south erly direction. 



Note: See Commercial Fisheries Review , April 1965 p. 21. 



a^ ^ :^ i'fi ^ 



SAN FRANCISCO BAY 

 INVESTIGATIONS CONTINUE D 

 M/V ''Nautilus'' Cruise 65 



TT 



2_(July 27- 



August 1, August 26-30, September 25-30, 

 November 2-7, November 30-December 5, 

 and December 16-21, 1965): Studies in San 

 Francisco Bay were resumed with these 

 cruises by the research vessel Nautilus , op- 

 erated by the California Department of Fish 

 and Game. Objectives were to collect fish 

 and invertebrates and determine their dis- 

 tribution and seasonal population variations. 



The six stations worked in the Bay study 

 area had an average depth ranging from 15 

 to 50 feet. Station locations were: j mile 

 southeast of Redrock; i mile east of middle 

 of east side of Treasure Island; \ mile west 

 of middle of west side of Treasure Island; i 

 mile west of radar pylon on San Bruno shoal; 

 i mile north of red buoy at entrance of chan- 

 nel to Redwood City Harbor; i mile east of 

 Dumbarton railroad bridge. 



During the cruise a square -mouthed mid- 

 water trawl 25 feet on a side was towed for 



' UuU ' 



HENLO PARK 



Area of operations of M/V Nautilus Cruise 65-N-2 (July -Decem- 

 ber 1965). 



20 minutes at the surface. Each station was 

 also sampled by a 20-minute bottom tow with 

 a 15 -foot otter trawl having 1-inch mesh. 



As compared to 1963 and 1964, mean tem- 

 peratures in 1965 were higher in the summer 

 with a maximum of 19.7° C. (67.1° F.) in 

 August. September and October were colder 

 in 1965 than in 1963 and 1964. In November 

 and December there was little difference in 

 temperatures for the 3 years. 



Salinities in 1965 generally fell between 

 those of 1963 and 1964. Maximum for 1965 

 was 30.4 percent in August, and minimum 

 was 27.3 percent in December. 



A total of 72 tows yielded 122,958 fish of 

 53 kinds, but catches from a similar number 

 of drags were not recorded due to gear mal- 

 function, too many fish to hoist aboard, or 

 replication of sampling. 



Note: See Commercial Fisheries Review , October 1965 p. 24. 



