Hi SF,
Nice day on the water.
Were the sand shrimp (ghost shrimp =
Neotrypaea californiensis) molts or mortalities? This species
reproduces in spring / early summer. After guarding her from other suitors, a male will mate with a female after the female molts (like other decapod crustaceans such as Dungeness crabs). The female retains the fertilized eggs on her pleopods (swimming legs) under her abdomen for several months. Eventually, the offspring hatch out as zoea larvae and spend a month or more in the plankton until settling out to dig their own burrows in late summer / early fall in Washington. Ghost shrimp are i
mportant food resources to the gray whales that migrate to Puget Sound in the summer.
Steve