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-The fish embryo develops inside the egg.
-Eye spots will develop on the sides of the head, followed by the development
of the lenses.
-Over time the embryo's pigmentation (coloration of tissues) becomes numerous
including the lens of the eyes.
-As the embryo develops, it wraps around the inside of the egg.
-The heartbeat is evident. |
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-Hatching will occur once the embryo's yolk sac is fully developed.
-The tail of the embryo will break out of its egg shell and then it becomes
a free-swimming yolk sac larvae.
-The larvae's yolk sac is located near the abdomen. The larvae depends on their
yolk sac for nutrition until their mouth and eyes are fully developed. This
can take from 2-10 days depending on the fish species.
-The end of the yolk sac period signifies the larvae being
able to feed on live prey. |
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-Because their eyes are still developing, the larvae depends on feed that is
moving around (i.e. live feed) to help stimulate a feeding response.
-One of the first types of live feed that marine larvae eat are rotifers.
You can see the digested rotifers inside larvae as they appear white
in their stomach.
-Once the larvae is approximately 8 mm in length, Artemia (brine shrimp)
is often introduced as the next type of feed.
-When the larvae hatch, they have a finfold around its whole body
that looks like an outline.
-This fold will eventually develop into fins beginning the process of metamorphosis. |
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-Fish starts to eat dry feed and should thrive and show signficant growth rates
as long as the environment remains healthy.
-Organ systems are completely formed.
-Fins are fully formed.
-This period of development lasts until the gonards are
mature. |
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-Once the gonads are mature, the fish is now able to reproduce. This signifies
the adult stage.
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