CJS 67-8 was successful in some instances, but caused panic among some fish. Investigate use of MS222. No light reading taken (telethermometer malfunctioning) at 1935 hrs. - O2 = 0.5 (shlf) + temp of water at surface = 33.8°C. (shlf) Fish were taken again when the umbrella net was raised the second time (this time - ~75). These were added to the other in styrofoam cooler and five pictures were taken - dividing the fish arbitrarily into 5 groups to facilitate measuring from slides. Six of these fish (group) /♀ < 2♂ were preserved in 10% formaldehyde (w/copper sulfate). Again, these are included in the slides. All others released. Seeming increase in # of ♀ (or at least proportion of ♀ to ♂). Not substantiated, however, because of hurry due to impending darkness. Slides did not develop well - no measurements possible.