Presentation on theme: "Common Prey Items Along the Texas Coast: A Fly Fishing Perspective"— Presentation transcript:
1Common Prey Items Along the Texas Coast: A Fly Fishing Perspective Mark R. FisherScience DirectorRockport Marine Lab
2TPWD Resource Monitoring Program Overview Initiated in 1975.Stratified random sampling.Standardized methods.Gill nets (780/year).Bay trawls (1,680/year).Gulf trawls (960/year).Bag seines (2,160/year).Oyster dredges (1,200/year).Total—6,780/year.
3Sample Locations, 1975-2007 All Gears Combined 360 fish species324 invertebrate species
4Diet of Legal-Sized Red Drum and Spotted Seatrout Opportunistic predators.Diet reflects habitat, feeding mode, prey availability and prey size.Trout consume shrimp and fish.Reds consume crabs, shrimp and fish.
5Don’t put your finger in there! Upper PlateLower Plate
6Prey Items Can Be Highly Seasonal! Spawning occurs in Fall (croaker), Spring (silversides), Winter (mullet), or year-round (blue crab, killifish).Rapid growth rates for some (shrimp ~ 1 mm/day); juveniles are typically the only edible size.Different life stages utilize different habitats—juveniles typically inhabit shorelines, subadults and adults in open water.Our bays are not food-limited!
7Corpus Christi Bay Monthly Mean Water Temperatures
33Brown, Pink, and White Shrimp Browns are brown to olive green.Pinks are grayish to red-brown.Whites are bluish white.White
34Browns, White, and Pink Shrimp Life History Overview Offshore spawningEggs hatch within 24 hoursPostlarvae migrate into baysFast growth, ~ 1 mm/dayMigrate to deeper water as they get largerBrown—fall spawnersWhite—spring spawnersPink—spring spawners.Browns & pinks burrow during the day
53Common Bait Species Within Texas Bays PinfishBay anchovyInland silversideGulf menhadenMulletSheepshead minnowKillifishAtlantic croakerGrass shrimpWhite and brown shrimpBlue crabAtlantic brief squid
54Common Bait Species Along Texas Gulf Beaches MulletStriped anchovyDusky anchovyScaled sardineSpanish sardineBay anchovyRough silversideSeabobWhite and brown shrimpBlue crabSargassum shrimpSargassum crab
55Common Bait Species in Redfish Bay, South Bay and B&R Flats PinfishSheepshead minnowInland silversideKillifishMulletBay anchovyAtlantic croakerGobiesGrass shrimpWhite, pink, and brown shrimpBlue crabMud crabs