The Chicken And Egg Problem, this problem refers to all species

Still is all that's needed in most cases. In fact, I'd guess that the most common egg scenario even today is to simply take an unfertilized egg and toss it out unprotected into the environment. Throw them little eggs out there and hope a sperm drifts close by before the Whale Shark (of the animal fish whale big critter eating small critter kind) swims through.

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Aslan is not a Tame Lion

then you might want to research the spawning habits of many ocean fish and critters (particularly ones like coral).The most common egg laying tactic if you count the number of eggs, is to simply release the eggs into the water. The male and female of the species don't mate individually, but rather as a group. Egg and sperm are just thrown out, let free, cast into the waves.There's no protection for the eggs, none for the sperm, no inclosed gestation, just random mixing.It's well worth looking into. Fish eating in a cloud of coral spawn

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Aslan is not a Tame Lion