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Chapter 6 - Diadromous FishAmerican ShadAmerican shad may still occur in each of the drainagesrepresented (Figure 6-4), but it is important to note thataccessible, suitable spawning habitat is greatly reduced.For example, in the Merrimack River watershed inMassachusetts and New Hampshire, dams with ineffectivefish ladders prevent shad from accessing habitatsbeyond the second dam at Lowell, Massachusetts.In spring American shad abundances were greatest incoastal waters near Chesapeake and Delaware Bays,Hudson River, Long Island, and Massachusetts Bay(Figure 6-5a), and in fall in small areas off Rhode Islandand near the mouth of the Bay of Fundy (Figure 6-5b).Trends in shad abundance exhibit only a weak spatial signature,despite evidence from surveys of spawning runsthat shad have suffered huge declines. In spring wherethere is a trend at all it is generally increasing (Figure6-5c); in fall the few places with a trend are evenly splitAbetween increases and decreases (Figure 6-5d). Thesedata are clearly not informative with regard to overallabundance of shad; it is also possible that the number ofshad caught overall may be too small to represent trends inshad distribution.The spring persistence pattern (Figure 6-6a) is consistentwith spawning locations (Figure 6-4) in the Chesapeake,Delaware, and Hudson River for the Mid-Atlantic subsection,and it is likely that coastal waters near spawningrivers are important for staging of adults and/or overwinteringfor juveniles. In the two northern subsections,the areas of spring persistence are further offshore. Infall (Figure 6-6b), areas of persistence and abundance inthe northern Gulf of Maine reflect the more northernsummer distribution in the Bay of Fundy and Gulf of St.Lawrence indicated by tagging data (Dadswell et al. 1987).Additional important areas for shad not represented hereinclude wintering areas in deeper offshore waters.BFigure 6-6. Areas with high persistence and abundance over 40 years for American shad during the spring and fallseasons.6-10Northwest Atlantic Marine Ecoregional Assessment • Phase 1 Report
Chapter 6 - Diadromous FishFigure 6-7. Freshwater and estuarine distribution for American eel.Northwest Atlantic Marine Ecoregional Assessment • Phase 1 Report 6-11
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© Barry Truit, TNC© Donna A. Dewh
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Assessment Core TeamSally YozellJen
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Chapter 1 - IntroductionImportant s
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Chapter 1 - Introductionabsorb wave
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Chapter 1 - Introduction1) Gulf of
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Chapter 1 - IntroductionSpecies and
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Chapter 1 - IntroductionSea Turtles
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Chapter 1 - Introduction(NECIA 2007
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Chapter 1 - IntroductionMurawski, S
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Coastal EcosystemsCHAPTER2Barbara V
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Chapter 3 - Benthic HabitatsTechnic
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Chapter 8 - Small Pelagic FishSelec
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Large Pelagic FishCHAPTER9Jennifer
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Sea TurtleAdam Whelchel and Melissa
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