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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


Fish Life Cycle

Spawning

Adults

Eggs

ADULT

Environment

PELAGIC

Environment

Juveniles

Larvae

Settlement


Larval Development Stages


(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.


Gadidae

Gadus morhua


Molidae

Mola mola


Pelagic larvae

adaptations


Piscivorous

larvae


Leptocephali larvae


Metamorphosis

Bothidae

Bothus ocellatus


Engraulis encrasicolus


Fish Life Cycle

Spawning

Adults

Eggs

ADULT

Environment

PELAGIC

Environment

Juveniles

Larvae

Settlement


End of larval phase

  • Settlement

  • Metamorphosis

  • Recruitment

  • Colonization


Post-flexion

Epinephelus morio


Larval Transport Mechanisms

  • Passive Transport with currents

  • Behaviorally mediated

    • Diel Vertical Migrations

    • Active Directional swimming


Island wake or eddie

(Possible larval retention)


Long distance

transport


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


  • Plankton nets:

  • Mostly catch small larvae


  • Light traps:

  • Species that are

  • attracted to light

  • Only catch large larvae


Crest nets: source of postsettlement fishes for aquarium

and aquaculture


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