Depth Partitioning and Diel Movement of Two Large Carcharhinid Sharks in Extremely Shallow Waters

Two species of carcharhinid sharks aggregate every winter at the warm water effluent a coastal power plant on Israeli Mediterranean coast. The two (Carcharhinus obscurus and Carcharhinus plumbeus) cooccur in highly confined area for several months year are associated with around hot effluent. Niche partitioning has recently been suggested as mechanism that enables coexistence similar shark by resource partitioning, spatial temporal partitioning. In this study, we used acoustic telemetry to study individual diel movement activity patterns within enclosed examined differences between sharing it. Although location only reaches maximum depth 7.5 m, found both perform vertical movement, rising closer surface night moving deeper during daytime. Furthermore, swam different depths day night, C. swimming upper column, about 2 m shallower than plumbeus. very small scale which nearly equals sharks’ body length, suggests might be conserved level. Moreover, spatiotemporal may reflect mean interspecific occurs even shallow habitat.