6 Technical Paper 28: Bureau of Sport Fisheries and Wildlife 



R. V. Dolphin survey, 1965-66. Cruise schedule and transect sampling order 



Cruise 



Dates 



Transect sequence 



0-65-1* 



0-66-1 



D-66-3 



D-66-5 



D-66-7 



0-66-10 



D-66-12 



D-66-1U 



Dec. 3 - Dec. 15, 1965 

 Jan. 25 - Feb. 9, 1966 

 Apr. 6 - Apr. 22, 1966 

 May 12 - May 2k, 1966 

 June 17 - June 29, 1966 

 Aug,. 5 - Aug. 26, 1966 

 Sept. 28 - Oct. 20, 1966 

 Nov. 9 - Dec. k, 1966 



C to P 



B, A, C to P 



A to E2, F to P, E8 to E3 



A to Hk, P, N5 



A to 0, L to P, K to E 



A to P 



M, N, L to A, P 



El, to E7, F1 to F6, G to J, P to K, 



F7, E8, D to A 



The complete net weighs 35 pounds (16 kg.)- In 

 order to provide the least obstruction of flow of 

 water into the net, it is connected to :he towing 

 cable with a two-part bridle of 0.25 -inch 

 (6. 4 -mm.) chain, rigged from eyes at either 

 side of the mouth of the net. A 50 -pound (23 kg.) 

 cast bronze, high-speed depressor is suspended 

 from the sampler by 7 feet (2.1 m .) of 0.25- 

 inch (6. 4 -mm.) cnain. 



Figure 3: — Gulf V high-speed plankton net 

 with depressor attached. 



We used a Cobb Pelagic Trawl -Mark II, 

 scaled down to one -third the linear dimensions 

 of that described by McNeely (1963), in our 

 efforts to collect young nektonic stages of fish 

 large enough to avoid the plankton nets . This 

 mid -water net was made of 1 .5 -inch (38 -mm.) 

 stretch mesh, No. 9 nylon thread; the cod end 

 was lined with knotless nylon netting of 0.25- 

 inch ( 6 .4 -mm . ) stretch mesh . To enhance the 

 vertical opening of the net, 5 -inch (127 -mm.) 

 diameter floats were fastened at intervals on 

 the head-rope and 0.25 -inch (6 .4 mm .) chain 

 was lashed along the footrope . A pair of ply- 

 wood hydrofoils, reduced to 40 percent of the 

 area of those described by McNeely (1963), was 

 used to provide horizontal opening of the net. 

 Throughout the survey, minor modifications 

 were made to the gear in an attempt to improve 

 its performance. 



THE SURVEY 



Hydrographic data obtained at each 

 station consisted of vertical temperature and 

 salinity profiles, surface temperatures , and 

 records of weather conditions . Surface tem- 

 perature patterns are shown for each survey 

 cruise in Appendix figures Al to A8 . Bottom 

 temperatures for each cruise are shown in 

 Appendix figures Bl to B8 . Vertical temperature 

 profiles are shown for each transect of each 

 cruise in Appendix figures CI to C25. 



Salinity was measured at the surface and 

 at 5 -meter depth intervals as determined by 

 markings on the RS-5 salinometer cable. The 

 cable was kept as near vertical as possible by 



