California Red Rock Shrimp Development All research reported here was conducted in the Aquatic Nursery in 2008

Here in the Aquatic Nursery we are studying development of baby red rock shrimp. The adult female in this picture is gravid (pregnant). Under her abdomen she is carrying about 3,000 eggs!

To track growing eggs, we take a small sample from the mother. The sample is photographed under a microscope every few days to track development, which helps us predict when the larvae will hatch. Here we can see some cells in a baby shrimp starting to form the body!

The deep red color seen here is an early eye spot! 3 days post fertilization

13 days after fertilization, the eggs are fully developed and ready to hatch. Look at the black eyes and golden insides!

Once the eggs are fully developed, they give off a chemical that the mother can smell. This smell is the mother’s cue to agitate the eggs and force hatching. This is similar to the way we crack open a chicken egg. Watch the next three slides to see the first larvae hatch!

Watch this!

Here comes the baby shrimp!

The shrimp just hatched seconds ago!

Planktonic baby red rock shrimp Baby shrimp are born as plankton. They remain planktonic for 2-3 months before they settle on the ocean floor. Plankton = unable to swim against the currents

Metamorphosis = changes in body structure Red rock shrimp will undergo physical changes in their body, called metamorphosis. This is similar to a caterpillar spinning a cocoon and then weeks later transforming into a butterfly. Metamorphosis = changes in body structure

Here the eyes grow into stalks angled away from the head! 1 days post hatching 4 days post hatching

Look at how the tail split and changed shape! 8 days post hatching 23 days post hatching

Here new peloped buds and legs grew! 40 days post hatching 45 days post hatching

After metamorphosis is complete, they look like this. This baby is 61 days old and ready to settle!

Here is the last stage of growth known as settlement. Settlement = attachment of a larval animal to substrate or the sea floor