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L11_sensory1_11COLOR_new - FISH SENSORY SYSTEMS Sensory...

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FISH SENSORY SYSTEMS
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Sensory Systems - Vision - Chemoreception 1) Olfaction 2) Gustation - Mechanoreception 1) Hearing 2) Lateral Line - Electrical Senses
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Properties of water that affect sensory systems: 1) Dense : 800 times more dense than air 2) Incompressible : any particle that moves, moves a particle next to it a. Motion sensors: lateral line - senses water movement b. Sound sensors: inner ear (otoliths) and swimbladder in some 3) Conducts electricity well (marine especially): a. Ampullary receptors in elasmobranchs: Ampullae of Lorenzini b. Ampullary receptors + tuberous receptors in Osteichthyes 4) Barrier to light , turbid, absorbing and scattering light rays Light is selectively filtered out with depth: red, orange first >>> green, blue last 5) Chemicals in solution : chemoreception (taste and smell) can occur all over the body
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Sense Air Water Smell good good, but slow Taste good, needs contact good with liquids Vision very good good to not possible: depends on light absorption Hearing fair excellent, 4X faster and farther: water density Distant touch not possible good: water incompressible Electroreception not possible good: water conducts electricity Effectiveness of senses in Air vs Water
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1) forebrain (telencephalon + olfactory bulbs) = olfaction * 2) “between-brain” (diencephalon+ pineal gland) = homeostasis, endocrine, circadian rhythm * 3) midbrain (mesencephalon + optic lobes) = vision * 4) hindbrain (cerebellum) = hearing, balance and lateral line (acoustico- lateralis system) * 5) brainstem (Medulla oblongata + facial and vagal lobes) = lateral line, electroreception, taste * * * * * * * * * * * *
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Large olfactory lobes Large optic lobes e.g., Catfish e.g., Minnow
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Chemoreception 1. Olfaction (smell) •olfactory receptors in pits •can be extremely sensitive 2. Gustation (taste) •similar to humans, except ! •more acute (one molecule per receptor) •sensory cells (“taste buds”) not confined to mouth - barbels - fins - flanks
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Olfaction – HOW? Receptors in olfactory pits, in- and ex-current
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This note was uploaded on 01/10/2012 for the course EEMB 106 taught by Professor Staff during the Spring '08 term at UCSB.

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L11_sensory1_11COLOR_new - FISH SENSORY SYSTEMS Sensory...

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