Elder HS; Murphy BRJournal of Freshwater Ecology2010-02-152010-02-151997http://hdl.handle.net/1969.3/22847281-289Recent confirmation of grass carp spawning in the river systems entering Galveston Bay is a serious concern to many fisheries ecologists. Researchers suspect a portion of recent losses in submersed vegetation and marsh habitat in Galveston Bay may be due to the presence of grass carp. Grass carp captured in the Trinity River were examined to determine population structure, ploidy, fecundity, and diet. Fish captured were primarily diploids and represented a broad range of cohorts, providing strong evidence that naturally spawned grass carp are being recruited to adult sizes in the Trinity River. No evidence of submersed estuarine vegetation exclusive to Trinity Bay was found in the gut contents of grass carp examinedConservation; Ecology: Environmental Sciences; Freshwater Ecology: Ecology,Environmental Sciences; Nutrition; Wildlife Management: Conservation;FRESHWATER ECOLOGY; PLOIDY; POPULATION STRUCTURE; SPAWNING; TRINITY RIVER; VEGETATION LOSS;grass carp [Osteichthyes]; Ctenopharyngodon idella [Osteichthyes];Osteichthyes: Animals,Chordates,Fish,Nonhuman Vertebrates,Vertebrates;[00512] General biology - Conservation and resource management;[07506] Ecology: environmental biology - Plant;[07514] Ecology: environmental biology - Limnology;[07516] Ecology: environmental biology - Wildlife management: aquatic;[13202] Nutrition - General studies,nutritional status and methods;[85206] Osteichthyes;[85206] Osteichthyes,Pisces,Vertebrata,Chordata,Animalia;Journal