Final answer:
Not all fishes are strong swimmers; the strongest and fastest are typically found in open water environments. Adaptations vary, with some fish valuing maneuverability over speed. Fast swimmers like sharks and dolphins have streamlined body shapes to reduce drag in water.
Step-by-step explanation:
Not all fishes are strong swimmers. Fish adaptations are diverse, and their swimming capabilities vary widely. For instance, while certain types of sharks can reach speeds of up to fifty kilometers an hour and some dolphins can swim 32 to 40 kilometers per hour due to their streamlined body shape, other species of fish may prioritize maneuverability or camouflage over speed. The strongest and fastest swimmers are often found in open water environments where they need speed to catch prey or evade predators. On the other hand, slow-moving waters, such as those found near the mouths of rivers where sedimentation is higher and the water is murkier, tend to be inhabited by fishes that may use other senses such as taste or chemical cues to find food rather than relying on speed and vision.
Fish such as eels and rays have different body shapes and fin arrangements that allow them to maneuver in their respective environments, which might not necessitate high speed. Additionally, schooling fish can move rapidly away from threats, but this is more about coordinated movements rather than pure speed. Therefore, the fastest and strongest swimmers, adapted for reduced water resistance and high speeds, are typically found in open water environments.