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Air-breathing marine creatures must either come ashore to lay eggs, like turtles and some sea snakes, or else give birth to live young in surface waters, like whales and dolphins. Given their streamlined and transversely flattened bodies, heavily adapted for fast swimming, it would have been difficult, if not impossible, for ichthyosaurs to ...
The lake sturgeon is near the southern end of its range in Arkansas, more commonly found in the Upper Midwest. [86] Pallid and shovelnose sturgeon live in large, turbid rivers of the Mississippi Alluvial Plain , including the lower Arkansas, Mississippi, and lower White rivers downstream of impoundments.
The shortfin mako, an exceptionally fast species of shark, sometimes take on swordfish; dead or dying shortfin makos have been found with broken-off swords in their heads, revealing the danger of this type of prey. [22] Juvenile swordfish are far more vulnerable to predation, and are eaten by a wide range of predatory fish.
Most fish species spawn eggs that are fertilized externally, typically with the male inseminating the eggs after the female lays them. These eggs do not have a shell and would dry out in the air. Even air-breathing amphibians lay their eggs in water, or in protective foam as with the Coast foam-nest treefrog, Chiromantis xerampelina .
Adult swordfish have no teeth, and other billfish have only small file-like teeth. They swallow their catch whole, head-first. Billfish do not normally spear with their bills, though occasionally a marlin will flip a fish into the air and bayonet it. Given the speed and power of these fish, when they do spear things the results can be dramatic.
The spawn (eggs) of a clownfish.The black spots are the developing eyes. Spawn is the eggs and sperm released or deposited into water by aquatic animals.As a verb, to spawn refers to the process of freely releasing eggs and sperm into a body of water (fresh or marine); the physical act is known as spawning.
Livebearers are fish that retain their eggs inside the body and give birth to live, free-swimming young. They are especially prized by aquarium owners. They are especially prized by aquarium owners. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies , mollies , platies and swordtails .
The chain catshark is oviparous, laying its eggs to hatch in the water. Great white shark: The great white shark is ovoviviparous, gestating eggs in the uterus for 11 months before giving birth. Scalloped hammerhead: The scalloped hammerhead is viviparous, bearing its young after nourishing hatchlings internally. Cyphotilapia frontosa