seasonal variations in growth physiology of forage fish l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Seasonal Variations in Growth Physiology of Forage Fish PowerPoint Presentation
Download Presentation
Seasonal Variations in Growth Physiology of Forage Fish

Loading in 2 Seconds...

play fullscreen
1 / 21

Seasonal Variations in Growth Physiology of Forage Fish - PowerPoint PPT Presentation


  • 127 Views
  • Uploaded on

Seasonal Variations in Growth Physiology of Forage Fish. Ashwin Sreenivasan University of Alaska Fairbanks School of Fisheries and Ocean Sciences. Juvenile Fish Growth. Affected by environmental variation: seasonality habitat temperature diet Direct and indirect effects on growth

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Seasonal Variations in Growth Physiology of Forage Fish' - merry


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
seasonal variations in growth physiology of forage fish

Seasonal Variations in Growth Physiology of Forage Fish

Ashwin Sreenivasan

University of Alaska Fairbanks

School of Fisheries and Ocean Sciences

juvenile fish growth
Juvenile Fish Growth
  • Affected by environmental variation:
    • seasonality
    • habitat
    • temperature
    • diet
  • Direct and indirect effects on growth
  • Complex interactions
juvenile fish growth3
Juvenile Fish Growth
  • Growth
    • reproduction
    • condition
    • ecological growth models
  • Growth estimation methods
    • baseline data
    • seasonal metabolic patterns
    • population health
physiological growth estimation
Physiological Growth Estimation
  • Physiological growth indices
    • growth at tissue level
  • Influence of specific parameters
    • biotic and abiotic
  • Growth responses across taxa
  • Vital inputs in ecological growth models
physiological indices criteria
Physiological Indices Criteria
  • Desired characteristics of a growth index

- sensitivity

- rapidity of response

- utility in meshing field and lab data

  • Physiological growth indices exhibiting above criteria
    • cellular metabolic enzyme activity
    • cellular RNA/DNA ratios
cellular rna dna r d ratio
Cellular RNA/DNA (R/D) Ratio
  • DNA-cell number/biomass
  • RNA-protein synthesis
  • Nutritional stress

-RNA fluctuation

  • RNA concentration/activity variation
    • protein synthesis
    • tissue growth
    • nutritional condition
current research forage fish
Current ResearchForage Fish
  • Forage fish-Pacific herring, larval gadids (P.cod, pollock)
    • critical ecological importance in Alaskan waters
  • Cascade effect
    • key prey
    • Pacific cod, walleye pollock, salmon
  • Seasonal growth physiology

-temperature stress

-overwinter stress

-starvation stress & recovery

current research
Current Research
  • Collaboration: NOAA Auke Bay Laboratories Habitat Division
  • Field and lab component
  • Seasonal biology
  • Growth

-temperature

-diet

  • Integration of indices
  • Bioenergetic patterns/responses
research study samples
Research Study Samples
  • Juvenile Pacific herring (Clupea pallasii) growth (2008 1st and 2nd series)
    • habitat
    • temperature (6oC, 8.5oC, 12.5oC)
    • diet (starvation/compensatory growth)
  • Larval Pacific cod (Gadus macrocephalus) growth (2008 & 2009)
    • temperature (5oC, 8oC)
    • diet
  • Larval Walleye pollock (Theragra chalcogramma) growth (2008 & 2009)
    • temperature (5oC, 8oC)
slide10
Lab component: herring study
    • Marrowstone Marine Laboratory (USGS)
    • 0+/1+ herring growth
    • temperature/diet (6oC, 8.5oC, 12.5oC)
    • 2 phases: feeding and starvation
    • 3 temperatures
    • periodic sampling
    • March 2008
    • comprehensive seasonal growth information (R/D, lipids, proteins)
slide11
Lab component: cod study
    • Hatfield Marine Science Center (NOAA)
    • 0+ P.cod growth
    • temperature/diet
    • 2 concurrent phases
    • 3 temperatures
    • 4 diets
    • periodic sampling
    • April-May 2008
    • preliminary larval growth data
    • repeat in 2009
slide12
Lab component: pollock study
    • Hatfield Marine Science Center (NOAA)
    • 0+ pollock growth (larvae)
    • 2 temperatures
    • periodic sampling
    • April-May 2008
    • preliminary larval growth data
  • repeat in 2009
objectives
Objectives
  • Identify and compare temperature and diet influenced growth patterns in forage fish
  • Relate physiological growth patterns to survivability/resilience of forage fish stocks
  • Incorporate R/D patterns into R/D-temperature-growth models
  • Utilize growth patterns as inputs in formulating management plans
juvenile herring rna dna comparison compensatory growth temperature 2008 1 st series
Juvenile Herring RNA/DNA Comparison-Compensatory Growth/Temperature (2008 1st series)
juvenile herring lipid comparison compensatory growth temperature 2008 1 st series
Juvenile Herring Lipid Comparison-Compensatory Growth/Temperature (2008 1st series)
applications growth performance
Applications-Growth Performance
  • RNA activity-temperature caveat
  • R/D-growth-temperature calibration models
  • Growth performance (Gpf=G/Gmax)
  • Measure of larval condition
  • Formulation of reference growth rate (Gref)
  • Estimated Gpf across species
growth performance
Growth Performance
  • Applications to Pacific herring-specific growth models
  • R/D-growth-temperature models for starved herring across temperatures
  • Possible R/D cutoff point
  • Understanding growth during seasonal (winter) starvation and recovery periods in herring life-history
ongoing research
Ongoing Research
  • RNA/DNA analyses:

-juvenile herring (2nd stage replication)

-juvenile cod & pollock (2009 samples)

  • Metabolic enzyme analyses:

-juvenile herring (2008 samples)

  • Incorporation of R/D data into species specific growth models
acknowledgements
Acknowledgements
  • Rasmuson Fisheries Research Center Board
  • School of Fisheries and Ocean Sciences
  • Dr. Bill Smoker
  • NOAA Auke Bay Laboratory
  • Dr. Stanley Rice, Dr. Ron Heintz, and J.J. Vollenweider