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Early Life History PowerPoint PPT Presentation


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Early Life History. Fish Life Cycle Terminology Larval adaptations Fish Larvae Science. Fish Life Cycle. Spawning. Adults. Eggs. ADULT Environment. PELAGIC Environment. Juveniles. Larvae. Settlement. Larval Development Stages.

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Early Life History

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Early Life History

Fish Life Cycle

Terminology

Larval adaptations

Fish Larvae Science


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Fish Life Cycle

Spawning

Adults

Eggs

ADULT

Environment

PELAGIC

Environment

Juveniles

Larvae

Settlement


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Larval Development Stages


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(a) lake sturgeon, Acipenser fulvescens; (b) bloater, Coregonus hoyi; (c) chinook salmon, Oncorhynchus tshawytscha; (d) lake trout, Salvelinus namaycush; (e) northern pike, Esox lucius; (f, g) common carp, Cyprinus carpio; (h) brown bullhead, Ameiurus nebulosus; (i) largemouth bass, Micropterus salmoides; (j) yellow perch, Perca flavescens; (k) American eel, Anguilla rostrata; (l) Japanese anchovy, Engraulis japonicus; (m) Atlantic herring, Clupea harengus; (n) haddock, Melanogrammus aeglefinus; (o) walleye pollock, Theragra chalcogramma; (p) Atlantic cod, Gadus morhua; (q) striped bass, Morone saxatilis; (r) Atlantic croaker, Micropogonias undulatus; (s) bluefin tuna, Thunnus thynnus; California halibut, Paralichthys californicus.


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Gadidae

Gadus morhua


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Molidae

Mola mola


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Pelagic larvae

adaptations


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Piscivorous

larvae


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Leptocephali larvae


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Metamorphosis

Bothidae

Bothus ocellatus


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Engraulis encrasicolus


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Fish Life Cycle

Spawning

Adults

Eggs

ADULT

Environment

PELAGIC

Environment

Juveniles

Larvae

Settlement


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End of larval phase

  • Settlement

  • Metamorphosis

  • Recruitment

  • Colonization


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Post-flexion

Epinephelus morio


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Larval Transport Mechanisms

  • Passive Transport with currents

  • Behaviorally mediated

    • Diel Vertical Migrations

    • Active Directional swimming


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Island wake or eddie

(Possible larval retention)


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Long distance

transport


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Sampling of larval stages

All methods have different size and species selectivity

  • Plankton nets

    • Bongo nets

    • Multiple opening nets (MOCNESS)

    • Seine nets

  • Light traps

  • Reef crest nets


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  • Plankton nets:

  • Mostly catch small larvae


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  • Light traps:

  • Species that are

  • attracted to light

  • Only catch large larvae


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Crest nets: source of postsettlement fishes for aquarium

and aquaculture


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