1 Ichthyology ECOL 482/582 Fish Envy - Is It Wrong? Anatomy • External vs. Internal • Hard Anatomy • Soft Anatomy
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Ichthyology ECOL 482/582
Fish Envy - Is It Wrong?
Anatomy
• External vs. Internal • Hard Anatomy• Soft Anatomy
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Hard Anatomy - more in lab
External Anatomy
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External Anatomy
(dentary)
Fish Mouth Positions
subterminal
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Fish Mouth Positions
Fins - External AnatomyMedial Fins - Dorsal Fin, Caudal Fin, Anal Fin, Adipose
Lateral fins (paired) - Pelvic Fins, Pectoral Fins
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Internal Anatomy - FinsFin Spines and Rays
Modified Spines
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External AnatomyCaudal and Dorsal Fins
External AnatomyCaudal Fins
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Caudal Fin – Homocercal Tail
External Measurements
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Fish Teeth
Fish Teeth
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Scales – Placoid, Cosmoid, Ganoid, Cycloid,Ctenoid
cosmoidctenoid
cycloid
ganoid
placoid
External AnatomyScales
•Aging scales – Circuli and Annulus
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Internal AnatomyGill Arch – Cover Removed
Internal AnatomyGill Arches
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Fish Skeletons – so many bones, so little time – Axial vs Head
Internal AnatomyAxial Skeleton
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Internal Anatomy – Trunk
Abdominal Vertebrae
Caudal Vertebrae
AXIAL SKELETON
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The head skeleton of a fish = three components, the neurocranium(braincase), suspensorium (jaws plus whatever other structures suspend
them from neurocranium), and branchial skeleton (holds the gills).
Internal AnatomyHead – No neurocranium
SUSPENSORIUMPECTORAL GIRDLE
PELVIC GIRDLE
Branchial(Hyoid)
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Internal Anatomy – Head Amia calva
Internal Anatomy – Head Perca fluviatilis
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Other Characters
• Lateral Line System
• complete v incomplete