ANS18-10-L12-STURGEON-CULT

ANS18-10-L12-STURGEON-CULT - Sturgeons and Paddlefish...

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Unformatted text preview: Sturgeons and Paddlefish (Chondrostei) Animal Science 18 [email protected] Outline • Phylogenetic diversity of fish • General biology of condrosteans • Human impact • Aquaculture Class Pisces Basal group of vertebrates ~ 30 000 species Lineages: Jawless fish: hagfishes, lampreys Cartilaginous fish: sharks, skates, rays, chimeras Lobe-finned fish: coelacanth, lungfish Ray-finned fish: Chondrostei: sturgeons & paddlefish (27 species) Teleostei: modern fish (~ 23,000 species) Coelacanth Salmon Lamprey Whale shark Coelacanth Hagfish Chimera Sturgeon Chondrostei Polyodontidae Paddlefishes 2 species Acipenseridae Sturgeons shovelnoses 25 species 27 extant species, many endangered, some near extinction Fossils of chondrosteans are known from Jurassic (~200 My) European sturgeon ( Acipenser sturio) Heterocercal tail Scutes (bony plates) Rostrum Protruding mouth Paddlefish ( Polyodon spatula) General biology • Live in Northern Hemisphere • 27 extant species, most are endangered • Freshwater & anadromous • Longlived (150 yr), some very large (3,000 lbs) • Sexually mature at late age (10-30 yr) • Oviparous (egg laying), all spawn in the rivers • Forage on benthic invertebrates & fish (paddlefish - zooplankton) White sturgeon White sturgeon Geographic distribution Sturgeons (19 sp) Shovelnoses (6 sp) Paddlefishes (2 sp) Impact of humans...
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This note was uploaded on 03/26/2011 for the course ANS 18 taught by Professor Mchenry during the Spring '11 term at UC Davis.

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ANS18-10-L12-STURGEON-CULT - Sturgeons and Paddlefish...

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