[billsreef]

Whoever is able to get you those deepwater fish should be able to give the temperature and salinity data for the depth of collection. There are many factors that can effect temperature changes with depth, such as currents. It's not unusual to find the surface temperature to be the same or only a couple of degrees cooler at a 100ft. At the same time it's quite possible to hit a thermocline where the temperature rapidly changes several degrees in a only a couple of feet.