Fish habitat and otolith chemistry
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Fish Habitat and Otolith Chemistry. By Nate Bickford and Brenda Norcross. Otolith Introduction. The location and identification of essential fish habitat has become a major focus of fisheries management. Traditional assessments of habitat use have relied on mark and recapture techniques.

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Fish habitat and otolith chemistry

Fish Habitat and Otolith Chemistry

By

Nate Bickford

and Brenda Norcross


Otolith introduction

Otolith Introduction

  • The location and identification of essential fish habitat has become a major focus of fisheries management.

  • Traditional assessments of habitat use have relied on mark and recapture techniques.

  • Recently fisheries managers have used otolith chemistry to identify fish movement and habitat.


Fish in chukchi

Fish in Chukchi

  • Fish were collected during the Russian American Long Term Census of the Arctic (RUSALCA) Cruise

  • Bering Flounder (Hippoglossoides robustus)

  • BF is one of the most abundant flatfish in the Chukchi Sea.


Methods

Methods

  • Fish were collected from 7 sites in the Chukchi Sea.

  • Otolith were removed and thin sectioned in a clean environment.

  • Chemical analyses were done by Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS; otoliths; LSX-500).

  • We are looking for elemental differences between core (natal) and edge (where they were collected).

  • Elemental ratio we are concerned with are Sr/Ca Sr87/Sr86, Ba/Ca, and Mg/Ca.


Fish habitat and otolith chemistry

Bering Flounder

were collected

at sites –

13, 15, 18,

20, 23, 25, and 58


Fish habitat and otolith chemistry

  • Using a Quadratic Discriminant Analysis (QDA) different sites were grouped as water masses

  • Then I used the QDA to predict the membership in each water mass


Fish habitat and otolith chemistry

72º

58

70º

20

18

23

WM1

68º

25

WM2

15

13

66º

6

180º

170º

160º

  • There are multiple stocks of Bering flounder in the Chukchi Sea.

  • Water mass 2 is essential for Bering Flounder in the Chukchi Sea

  • Why is the habitat in water mass 2 better


Preliminary data

Preliminary data

  • Gymnocanthus tricuspis, Arctic staghorn sculpin

  • Also collected during the RUSULCA cruise


Fish habitat and otolith chemistry

Arctic Staghorn

Sculpin

were collected

at sites –

6, 11,13, 15,

17,18,20, 23,

25, 27, 58 62,

73, 85, 106,

and 107


Artic staghorn

Artic staghorn

  • Possible multiple groupings in three to four water masses

  • Next Step – discriminant statistics


Fish habitat and otolith chemistry

Acknowledgments

  • Funding

    • National Science Foundation

  • Sonja Bickford

  • Robyn Hannigan

  • Brenda Norcross

  • Chris Stark

  • Brenda Holliday

  • Matt Keyse

  • Fisheries Otolith Group (FOG)

  • Tom Weingartner

  • Seth Danielson


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