- 48 - 



Biolosical Data 

 Phj'toplankton: depth (m) of chlorophyll a (mg/m^, 1, 0. 14; 15, 0. 16; 30, 0. 20; 50, 0. 75; 90, missing; 140, 0. 16. 

 Water column chlorophyll a: 48 mg/m . Phytoplankton haul taken. 

 Zooplankton: N-C N, o to 301 m, 1811-1845 GCT, 90 ml T, 90 ml S; H at m, 1819-1848 GCT, 18e ml T, 18e ml S. 



STATION 51 

 (regular night) 



May 15, 1958; 0605-0830 GCT; 5°55. 5'N, 87°16'W; 1310 fm; wind, 010% force 4; temp. , 81. 8°F dry, 79.0'Fwet; 

 weather, 02; clouds, missing; sea, missing; swell, 010°, missing; time zone 6. 



Biological Data 



Zooplankton: N-C N, o to 306 m, 0736-0809 GCT, 252 ml T, 252 ml S; H at m, 0744-0813 GCT, 139e ml T, 

 131e ml S. 



Nekton: o, depth missing, 0613-0722 GCT, 142 ml T. 



STATION 52 

 (special) 



May 15, 1958; 1130-1325 GCT; 5°31. 5'N, 87''21.5'W; 1175 fm; wind, 010°, force 3; temp. , 80.0'F dry, 78.0°F wet; 

 weather, 50; clouds, 6, amt. , 10; sea, 2; swell, 010°, missing; time zone 6. 



Biological Data 



Zooplankton: N-C N, o to 280 m, 1138-1211 GCT, 67 ml T, 67 ml S; H at m, 1146-1215 GCT, 58e ml T, 58e ml S. 



Nekton: o, depth missing, 1225-1325 GCT, 42 ml T. 



STATION 53 

 (special) 



May 15, 1958; 1405-1610 GCT; 5°33.5'N, 87°04.5'W; 45 fm; time zone 6. 



2 

 Incident solar radiation: daily T 140 gm-cal/cm , day L 11. 80 hr. 



Biological Data 



Zooplankton: N-C N, H at 63 m, 1525-1559 GCT, 105 ml T, 105 ml S; H at m, 1535-1555 GCT, 152e ml T, 

 152e ml S. 



Nekton: H at 20 m, 1411-1512 GCT, 26 ml T. 



STATION 54 

 (regular night) 



May 16, 1958; 0136-0435 GCT; 5°32. 5'N, 87°22. 5'W; 1150 fm; wind, 240°, force 2; temp. , 83. 1°F di-y, 78. 9°F wet; 

 weather, missing; clouds, 6, amt. , 6; sea, 2; swell, 190", missing; time zone 6. 



Biological Data 



ZooplaJikton: N-C N, o to 280 m, 0144-0217 GCT, 68 ml T, 68 ml S; H at m, 0150-0220 GCT, 138 ml T, 138 ml S. 



Nekton: o, depth missing, 0234-0339 GCT, 209 ml T. 



Night-lighting operations. 



