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Local natural history is highlighted by displays of butterflies , shells , sponges and corals , crabs , earthquakes and tsunamis , and live native animals including a 50-gallon tide pool tank and a living observation bee hive . These small invertebrates can attach themselves to a wide variety of surfaces , including rocks , corals , crabs , and even whales . The animals I saw were squids , crabs , lobsters , and seastars . This kind of elevated endemism occurs among the numerous invertebrates in the lake , most especially the molluscs ( which possess similar forms to that of many marine molluscs ) , crabs , shrimps , copepods , jellyfishes , leeches , etc.Several species of cichlid , including many shell-dwelling species , have also become popular as aquarium fish due to their unique and attractive colouration and body shapes , unusual lifestyles and relatively high intelligence . Researchers observed coral species supporting thriving populations of invertebrates as diverse as tubeworms , shrimp , brittle stars , sea slugs , crab , colonial and solitary sea anemones and feather stars . An assemblage of small goby fish ( mudskippers ) , crabs , shrimp , and a variety of other invertebrates colonizes these mounds forming a complex community that is washed with sea water twice a day as the tides rise and recede . The Atlantic croaker 's diet includes shrimp , crabs , and detritus ( dead and decomposing plant and animal matter ) . These organisms may be plants , fish or shellfish - - oysters , mussels , clams , shrimp , crabs , crawfish . White and brown shrimp , crabs , and various sport fishes such as red drum , speckled trout and flounder thrive in the park 's lakes and bayous . Populations of seabirds , fish ( pacific cod , whiting , walleye pollock , salmon ) , crabs , eelgrass , and tidepool life ( sea anemones , sea urchins , sea stars ) have plummeted in the last few years . ” Nothing is truer than this statement when it comes to the management of Texas ’ valuable coastal resources of fish , shrimp , crabs , oysters and marine and estuarine habitat .