Chenanisaurus was a predator, like other abelisaurids.
Given its size, it could have hunted relatively large prey.
The lower jaw suggests a relatively short powerfully built head and jaws .
Along with the large size of the animal, the proportions of the jaws would have given it a powerful bite force, suggesting the ability to prey on relatively large dinosaurs.
 
Titanosaurian sauropods have been found in the same beds, and were likely prey for Chenanisaurus.

The presence of Chenanisaurus in the phosphates is unusual because the phosphates represent a marine environment.
Most of the fossils known from these beds are therefore marine animals, such as sharks, fish, mosasaurs, and plesiosaurs .
The presence of Chenanisaurus in these beds is therefore surprising.
It is possible that some animals died and were washed out to sea by rivers; it is also possible that Chenanisaurus sometimes entered the ocean to swim.

Other Gondwanan continents, such as South America, India, and Madagascar show a similar combination of titanosaurians and abelisaurids in the latest Cretaceous, suggesting a distinct evolutionary history from the Laurasian continents of Asia and North America.

The finding of Chenanisaurus and these fragments of titanosaurids also indicate that in Africa, an abelisaurid/titanosaur fauna existed just prior to the Cretaceous–Paleogene extinction event, suggesting that the faunal assemblage of Gondwana was relatively stable until that point in time.
Chenanisaurus' remains were found in marine deposits that comprise most of the Sidi Chennane phosphate mines, indicating that post-mortem, the theropod had washed out to sea, where the holotype specimen became fossilized.
Chenanisaurus was a predator, like other abelisaurids. Given its size, it could have hunted relatively large prey. The lower jaw suggests a relatively short powerfully built head and jaws . Along with the large size of the animal, the proportions of the jaws would have given it a powerful bite force, suggesting the ability to prey on relatively large dinosaurs.  
Titanosaurian sauropods have been found in the same beds, and were likely prey for Chenanisaurus. 
The presence of Chenanisaurus in the phosphates is unusual because the phosphates represent a marine environment. Most of the fossils known from these beds are therefore marine animals, such as sharks, fish, mosasaurs, and plesiosaurs . The presence of Chenanisaurus in these beds is therefore surprising. It is possible that some animals died and were washed out to sea by rivers; it is also possible that Chenanisaurus sometimes entered the ocean to swim. 
Other Gondwanan continents, such as South America, India, and Madagascar show a similar combination of titanosaurians and abelisaurids in the latest Cretaceous, suggesting a distinct evolutionary history from the Laurasian continents of Asia and North America.
The finding of Chenanisaurus and these fragments of titanosaurids also indicate that in Africa, an abelisaurid/titanosaur fauna existed just prior to the Cretaceous–Paleogene extinction event, suggesting that the faunal assemblage of Gondwana was relatively stable until that point in time. Chenanisaurus' remains were found in marine deposits that comprise most of the Sidi Chennane phosphate mines, indicating that post-mortem, the theropod had washed out to sea, where the holotype specimen became fossilized.
Chenanisaurus