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CERP: F2 Experiment

CERP: F2 Experiment. Focused on exposing adult mummichogs to 4 levels of contaminated sediments Clean and contaminated food. njwrri.rutgers.edu/graduate/. Objectives I. F2 experiment:. Mortality estimates Measure growth in length and weight Quantify egg production

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CERP: F2 Experiment

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  1. CERP: F2 Experiment • Focused on exposing adult mummichogs to • 4 levels of contaminated sediments • Clean and contaminated food njwrri.rutgers.edu/graduate/

  2. ObjectivesI.F2 experiment: • Mortality estimates • Measure growth in length and weight • Quantify egg production II. Egg performance experiment (EP) • Measure egg size, hatching success, andsize at hatch for larvae ehpnet1.niehs.nih.gov/docs/ 1996/104-9/innov.html

  3. F2 Experiment • Sediment treatment • Elizabeth River mud diluted to 6.25 % (ERL) , 12.5 % (ERM), and 25 % (ERH) • Fishing Bay (FB) mud as control • Same as F1 experiment • Clean/contaminated food treatment • Contaminated clams: Live clams were placed out in the ER river on 2 occasions for 6-7 weeks (T) • Clean clams: live clams were bought from a local seafood market (Chester and Ware Rivers) (C) • Clams were mixed with fish gel and water to make ‘clam jello’ • Example • ERMT =Elizabeth River 12.5 % (medium) dilution and toxic food treatment

  4. Characteristics of clean & contaminated food PAH Accumulation in Mercenaria (note scale change) Control Elizabeth River

  5. F2 Experiment • 24 50-gallon flow-through • tanks fitted with manifolds that • released incoming flow just • above the sediment surface • to mix water column • 3 replicates per treatment • Extra aeration was added to each tank • 56 fish were added to each tank ranging from 40-73 mm (~F1) • Fish were fed 0.03 g/g/day of their body weight for the first • 30 days then switched to 0.06 g/g/day after day 30 (same as • low food from F1)

  6. F2 Experiment • 4 sampling days: Days 0, 30, 59, and 74 • Experiment ran from 6/11/03- 8/22/03 • Sub-samples of fish removed for biomarker • expression, chemical analysis, bioenergetic • partitioning, and growth • Eggs collected from each tank • Egg production (daily), hatchability (weekly), and egg/larvae size estimates (weekly)

  7. F2 Experiment • Fish were fed twice a day • (by hand) • Salinity, temperature, DO • measurements taken daily • Egg collectors and flow • rates checked daily • Tanks were checked daily • for dead/dying fish

  8. F2 Experiment Environmental Parameters Salinity: 7.5 –11.1 ppt 2002: 11.3-20.9 ppt Temperature: 20 – 24 oC 2002 18.3-22.4 oC DO: - 5.1-8.4 mg L-1 - No problems with hypoxia or anoxic mud this time! Flow rate: 300 mL min –1 - same as higher flow in 2002 www.elizabethriver.org/monitoring/ mummichogfacts.htm

  9. Day 59 P<0.0001 Sediment B B B B A A A A Adult Fundulus mortality by treatment Food Sediment Day 74 C C B B A A AB AB A B A B A B A B P<0.0001

  10. Mortality comparisons from the last day of sampling for F1 and F2 experiments

  11. Disease prevalence: fish with red fins and nape • Problems with seawater system may have contributed– • times when there was no water flow for half a day, • several days in a row • Algal bloom? • Food differences? • Pellet food vs • clam jello • No energy • effect • Brood effects? • Other expts using fish • from same collections • experienced higher than expected mortalities • Other expts using different fish experienced high morts as well Differences between F1 and F2 experiment:

  12. Adult Fundulus mean length by treatment

  13. Adult Fundulus mean absolute growth rate in length (+/- SD) for day 59 and 74 No sediment or food effect on growth

  14. Mean growth on the last day of sampling for F1 and F2 experiment Slightly slower growth in 2003 than 2002

  15. Mean egg production by week throughout the F2 experiment

  16. Mean egg production for F1 and F2 experiments

  17. Total egg production (+/- SD) from F2 experiment Food effect: p=0.0096 Sediment effect: p=0.0527 B A B A B A B A

  18. Total egg production for F1 and F2 experiments

  19. Egg Performance (EP) experiment: • Eggs were collected daily from collectors in each tank. Eggs were subsequently grouped by week # of the F2 experiment • Eggs incubated for 14 days in standard culture media, exposed to air for 2 hours and then placed into highly aerated seawater for 30 minutes • This hatching process occurred for 3 days, eggs unhatched on the 3rd day of the hatching process were termed “unhatched” or “dead” www.miljolare.no/virtue/img/Species/ pages/Fish%20eggs.php

  20. EP experiment: Mean area (+/- SD) of eggs by week collected from F2 experiment

  21. EP experiment: Mean length (+/- SD) of larvae at hatch by week

  22. EP experiment: Mean % hatching success (+/- SD) of eggs by week collected from F2 experiment

  23. Egg and larval traits from EP experiments • F2 showed similar results with F1 that there • appears to be no difference among sediment • or food treatments: • Larval length • Egg area • Hatching success

  24. Conclusions: • Growth appeared to be affected by the lower food level • at the start of the expt and the presence of disease • Egg production • Higher and longer time of egg production than F1 • Egg production was significantly higher in the toxic tanks • Dose response curve with higher total egg production • in the FB tanks (marginally significant) • There were no apparent differences among sediment or • food treatments with larval and egg • size or traits www.whoi.edu/fishtox/ bonyfish.html

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