The potential use of Atlantic silverside (Menidia menidia) for monitoring estuarine pollution.
Monitoring chronic impacts of nearshore pollution on fish in Atlantic marine systems is challenging due to the mobility and seasonal nature of most habitat use. We evaluated Atlantic silverside (Menidia menidia) as a potential indicator of pollution across a gradient of contaminated sites in the Saint John River Estuary, New Brunswick, Canada. Fish returning from offshore in the spring showed no differences in length, weight, or condition factor between sites, but a graded response in condition factor appeared gradually, consistent with levels of contamination. Gonad size peaked in early June, however no differences in GSI were found among sites. By September, most fish collected were young of the year, with a significant bias towards female juveniles at the exposed site. These results indicate that Atlantic silverside are locally resident during their onshore period, and demonstrates their potential as a sentinel species. Sampling should focus on early June prior to the full moon to ensure maximal exposure periods before spawning, or in late October to evaluate growth as fish grow rapidly prior to offshore movement.
Canadian Rivers Institute and Department of Biology, University of New Brunswick, Saint John, NB, Canada E2L 4L5. meghan.doyle@unb.ca
Meghan A
MA
Doyle
Thijs
T
Bosker
Kelly R
KR
Munkittrick
D025041:Animal Migration; D000818:Animals; D049628:Body Size / Q000187:drug effects*; D004784:Environmental Monitoring / Q000379:methods*; D005260:Female; D019015:Geologic Sediments / Q000737:chemistry; D006066:Gonads / Q000187:drug effects* / Q000254:growth & development; D008099:Liver / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development; D008297:Male; D019216:Metals, Heavy / Q000032:analysis / Q000633:toxicity; D009509:New Brunswick; D009792:Oceans and Seas; D009929:Organ Size / Q000187:drug effects; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000633:toxicity; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000633:toxicity; D012621:Seasons; D023701:Smegmamorpha / Q000502:physiology*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*; D014877:Water Pollution, Chemical / Q000009:adverse effects* / Q000032:analysis
D019216:Metals, Heavy; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls