Short Term Use of a Low Tide Refuge in a Sandflat by Juvenile Chinook, (Oncorhynchus tshawytscha), Fraser River Estuary

In May 1980 catch patterns, sizes, and diets of juvenile chinook salmon (Oncorhynchus tshawytscha) were examined in a low tide refuge in a sandflat on Sturgeon Bank, Fraser River estuary. Low tide refugia may be critical habitats for juvenile Chinook because of their increased concentrations and vulnerability to environmental effects at these locations.

Simple

Date (Publication)
2019-08
Responsable
Nom de l'organisation Nom de la personne Adresse e-mail Rôle

DFO

Colin Levings

 		Point de recherche
Forme de la présentation
Document numérique
Nom

Canadian Technical Report of Fisheries and Aquatic Sciences No 1111
Autres informations de référence

1770 kb
But

This report provides observations made at a low tide refuge or pit in a sandflat on Sturgeon Bank, Fraser River estuary. The work reported here focussed on medium scale and short term habitat differences in space and time. The size distribution of juvenile chinook was compared on a space scale of tens of me tres, and differences in fish catches, prey abundance, and water characteristics were measured over tidal cycles.
Etat
Finalisé
Fréquence de mise à jour
Non planifiée

Global Change Master Directory (GCMD) Science Keywords v15.9

  • Earth Science > Biological Classification > Animals/Vertebrates > Fish > Ray-finned Fishes > Salmons/Trouts

  • Earth Science > Biosphere > Aquatic Ecosystems > Estuarine Habitat

DFO Areas

  • North Pacific Ocean > Fraser River and BC Interior
Langue de la ressource

English
Encodage des caractères
Utf8
Catégorie ISO
  • Biologie, faune et flore
  • Environnement
Description

49°11,-123°14'
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Début
1980-05
Fin
1980-05
Informations supplémentaires

In May 1980 catch patterns, sizes,and diets of juvenile chinook salmon (Oncorhynchus tshawytscha) were examined in a low tide refuge in a sandflat on Sturgeon Bank, Fraser River estuary. Purse seine catches increased on falling tides. Fish caught around the perimeter of the refuge with a beach seine were about 10 mm smaller than those from simultaneous purse seining about 80 m offshore. Adult insects were abundant in stomachs in the early part of the ebb cycle, and cumaceans were consistently common in the diet. Neomysis mercedis abundance in stomachs showed a peak shortly after low water. Invertebrate catches in a 1 m deep drift sampler with 6 vertical nets were highest when tidal currents were strongest, increasing over 3 orders of magnitude. Adult insects were caught only in the surface nets, mysids in the bottom 2, and cumaceans were found in all 6 nets. The increased flux of invertebrates on falling tides or concentration of prey in reduced water volumes may influence food availability for fish. Low tide refugia may be critical habitats for juvenile Chinook because of their increased concentrations and vulnerability to environmental effects at these locations.
Format (encodage)
Nom Version

electronic

none
Contact
Nom de l'organisation Nom de la personne Adresse e-mail Rôle

Pacific Salmon Foundation

Isobel Pearsall

pearsalli@shaw.ca

Distributeur
Ressource en ligne
Protocole Adresse Internet Nom

WWW:LINK-1.0-http--link

 		https://www.dfo-mpo.gc.ca/science/data-donnees/index-eng.html

DFO Science website

WWW:DOWNLOAD-1.0-http--download

 		https://soggy2.zoology.ubc.ca/geonetwork/srv/api/records/c023d1b3-e28d-4fba-92b6-8be09f4584d6/attachments/c023d1b3-e28d-4fba-92b6-8be09f4584d6.pdf c023d1b3-e28d-4fba-92b6-8be09f4584d6.pdf

WWW:DOWNLOAD-1.0-http--download

 		https://soggy2.zoology.ubc.ca/geonetwork/srv/api/records/c023d1b3-e28d-4fba-92b6-8be09f4584d6/attachments/c023d1b3-e28d-4fba-92b6-8be09f4584d6.xlsx c023d1b3-e28d-4fba-92b6-8be09f4584d6.xlsx
Niveau
Jeu de données
Généralités sur la provenance

Levings produced paper copy. Fraser scanned with Fujitsu Scansnap s1500 (ABBY Finereader OCR software). Data was extracted through Adobe Reader conversion and manual entry into MS Excel.

Métadonnées

Identifiant de la fiche
c023d1b3-e28d-4fba-92b6-8be09f4584d6 XML
Langue

eng
Jeu de caractères
Utf8
Type de ressource
Jeu de données
Date des métadonnées
2023-12-18T21:37:04.266Z
Nom du standard de métadonnées

North American Profile of ISO19115:2003 - Geographic information - Metadata
Version du standard de métadonnées

NAP - CAN/CGSB-171.100-2009
Contact
Nom de l'organisation Nom de la personne Adresse e-mail Rôle

Pacific Salmon Foundation

Sarah Fraser

fraser.sarahk@gmail.com

Auteur
Autre langue
LanguageCode CharacterEncoding
Français Utf8
Anglais Utf8
 
 

Aperçus

thumbnail

Étendue spatiale

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Mots clés

Global Change Master Directory (GCMD) Science Keywords v15.9
Earth Science > Biological Classification > Animals/Vertebrates > Fish > Ray-finned Fishes > Salmons/Trouts Earth Science > Biosphere > Aquatic Ecosystems > Estuarine Habitat

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