Charig and Milner had proposed a piscivorous (fish-eating) diet for the closely related Baryonyx in 1986.
This was later confirmed in 1997 with the discovery of partially digested fish scales found in the Baryonyx holotype.
In 1998 Sereno and colleagues suggested the same dietary preference for Suchomimus.
based on its elongated jaws, spoon-shaped terminal rosette, and long teeth reminiscent of those of piscivorous crocodilians.
American palaeontologist Thomas Holtz noted that spinosaurid teeth were adapted for grasping rather than slicing, hence their reduced serrations, which in most other theropods were more prominent.
Suchomimus's extensive secondary palate, which would have made the roof of the mouth more solid, allowed it to better resist twisting forces exerted by prey.
The rest of Suchomimus's body was not particularly adapted to the water.
The discovery of Suchomimus revealed that spinosaurid skulls were significantly shallower, more elongated and narrow than previously thought.

The use of the robust forelimbs and giant claws of spinosaurs remains a debated topic.
Charig and Milner speculated in 1986 that Baryonyx may have crouched by the riverbank and used its claws to gaff fish out of the water, similarly to grizzly bears.
In 1987, British biologist Andrew Kitchener hypothesized a use in scavenging carcasses, though this has been critiqued by other researchers who pointed out that in most cases, a carcass would have already been largely emptied out by its initial predators.
A 2005 study by Canadian paleontologist the François Therrien and colleagues posited that spinosaur forelimbs were probably used for hunting larger prey items, given that their snouts could not resist the bending stress.
In a 2017 review of the family, David Hone and Holtz also considered possible functions in digging for water sources or hard to reach prey, as well as burrowing into soil to construct nests.
Charig and Milner had proposed a piscivorous (fish-eating) diet for the closely related Baryonyx in 1986. This was later confirmed in 1997 with the discovery of partially digested fish scales found in the Baryonyx holotype. In 1998 Sereno and colleagues suggested the same dietary preference for Suchomimus. based on its elongated jaws, spoon-shaped terminal rosette, and long teeth reminiscent of those of piscivorous crocodilians. American palaeontologist Thomas Holtz noted that spinosaurid teeth were adapted for grasping rather than slicing, hence their reduced serrations, which in most other theropods were more prominent. Suchomimus's extensive secondary palate, which would have made the roof of the mouth more solid, allowed it to better resist twisting forces exerted by prey. The rest of Suchomimus's body was not particularly adapted to the water. The discovery of Suchomimus revealed that spinosaurid skulls were significantly shallower, more elongated and narrow than previously thought.
The use of the robust forelimbs and giant claws of spinosaurs remains a debated topic. Charig and Milner speculated in 1986 that Baryonyx may have crouched by the riverbank and used its claws to gaff fish out of the water, similarly to grizzly bears. In 1987, British biologist Andrew Kitchener hypothesized a use in scavenging carcasses, though this has been critiqued by other researchers who pointed out that in most cases, a carcass would have already been largely emptied out by its initial predators. A 2005 study by Canadian paleontologist the François Therrien and colleagues posited that spinosaur forelimbs were probably used for hunting larger prey items, given that their snouts could not resist the bending stress. In a 2017 review of the family, David Hone and Holtz also considered possible functions in digging for water sources or hard to reach prey, as well as burrowing into soil to construct nests.
Suchomimus