Family Clupeidae. River Herring of the James
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1 Family Clupeidae River Herring of the James
2 ANADROMOUS FISH There are 350 species of fish in the Chesapeake Bay! About 7 species are anadromous: the adults live in the Atlantic Ocean and migrate to the Chesapeake Bay and spawn upriver. Causes for population declines in anadromous fish: Overharvesting Habitat degradation, pollution Introduced species Damming of spawning grounds Boat strikes (sturgeon) Loss as bycatch in coastal fisheries
3 Anadromous Fish Life Cycles Spring/ Summer: Adults migrate upriver to spawn and return to the ocean; Fall: Juvenile Clupeids migrate to the bay and ocean; juvenile sturgeon reside in the river for multiple years before emigrating in the fall. James River Migration Chesapeake Bay Atlantic Ocean
4 CLUPEIDAE American shad Alosa sapidissima, most delicious Hickory shad Alosa mediocris, ordinary Blueback herring Alosa aestivalis, arrives in spring
5 American Shad (Alosa sapidissima) Appearance: silver-sided with greenish-blue back; deep bodied from the side, narrow and symmetrical top to bottom head-on; row of dark spots on the sides; the upper and lower jaws are equal length when the mouth is closed Length: inches (largest of the Clupeid family) Weight: 5 lb Feeding: pelagic; feed on plankton and small fish or fish eggs Spawning: spawn at night in 6-ft deep water; broadcast eggs into the water column; eggs will hatch in 7-10 days; juveniles stay in estuaries for up to a year; over half of the adults die after spawning
6 Hickory Shad (Alosa mediocris) Appearance: silver-sided with grayish-green back and a prominent dark spot, followed by a row of lighter spots; body long but compressed, asymmetrical top to bottom and in cross section it is wedge-shaped; the lower jaw protrudes significantly beyond the upper jaw when the mouth is closed; each scale on the sides has a small dark spot Length: inches Weight: 2 lb Feeding: pelagic; feed on plankton and small fish or fish eggs Spawning: spawning occurs at night; adults broadcast eggs into the water column; eggs float downstream and will hatch in 2-3 days; juveniles stay in freshwater a few months until temperatures begin to drop; adults often repeat spawn
7 Blueback Herring (Alosa aestivalis) Appearance: bluish along the back with a silvery head and side; compressed body; similar in appearance to Alewife Length: inches Weight: < 1 lb Feeding: pelagic; feed on plankton and small fish or fish eggs Spawning: spawn in quiet, upper portions of streams and creeks; broadcast eggs that stay in the water column; eggs float downstream and will hatch in 2-3 days; juveniles stay in freshwater for a few months until temperatures drop; some juveniles remain in the bay waters for up to 1 year; most adults die after spawning
8 American Shad
9 American Shad Shad once supported the largest fishery on the East Coast, with up to 20 million shad caught per year in the 1800 s!
10 Blueback Herring Early colonists and southern planters wri3ng of the annual spring spawning runs along Chesapeake Bay tributaries described rivers running thick with herring and shad such that a man could walk across the river channel without we<ng his feet. This abundant fishery soon became an economically important industry, with catches increasing drama3cally during the 1800 s as fishing techniques improved. The fishery peaked in the early 1900 s, with catches of shad in the Chesapeake Bay reaching 8 million pounds annually.
11 In 2007, the Atlantic States Marine Fisheries Commission, a panel of state and federal fishery managers responsible for managing migratory fish, completed an American shad stock assessment that concluded that shad stocks along the East Coast were "currently at all-time lows."
12 What are we doing to combat the decline of anadromous fish populations? Large-scale stocking efforts Fish passage projects Fishing regulations along the coast
13 What are we doing to combat the decline of anadromous fish populations? Large-scale stocking efforts Fish passage projects Fishing regulations along the coast
14 Rearing Herring and Shad Scien3sts collect eggs from adult females and milt (sperm) from adult males and mix the reproduc3ve material together. Fer3lized eggs are then taken to the hatchery to incubate and develop into fish fry. Larval fish are released at various tributaries along the James River. Adult Blueback Herring
15
16 Eggs are incubated in the tubes along the tanks. Once eggs mature, fish fry travel up the tube and into the large silver tank. At Harrison Lake National Fish Hatchery, American shad have been intensively stocked since Since then, biologists have stocked millions of shad fry!
17 American Shad Fry
18 American Shad Fry
19 Fish from the hatchery are tagged with a special OTC marker so adults can be identified when they return during their migration. OTC is a chemical that gets incorporated into the fish ear bones (called otoliths) and can be viewed under a fluorescing microscope. Biologists release larval fish into the river.
20 What are we doing to combat the decline of anadromous fish populations? Large-scale stocking efforts Fish passage projects Fishing regulations along the coast
21
22 Fish ladders provide a means for fish to move beyond dams. Fish Ladder at Bosher s Dam
23 The fish ladder at Bosher s Dam has a viewing window to monitor migration of anadromous fish.
24 View LIVE ShadCam footage in the spring!
25 What are we doing to combat the decline of anadromous fish populations? Large-scale stocking efforts Fish passage projects Fishing regulations along the coast
26 American shad: No Restrictions Hickory shad: No restrictions Blueback Herring: Moratorium. The VA Marine Resources Commision issued a moratorium during spring 2012 and remains in effect today (2017) making it illegal to catch or possess blueback herring or alewives in the James River.
27 American Shad In the effort to restore fish populations, abundance goals were set. The figure shows what percentage of this goal was met in The Rappahannock has had a small and slightly increasing population over the last decade. The Potomac, has shown a marked increase over the past 15 years. The York, Susquehanna, and James have showed little to no improvement. The populations have not rebounded.
28 E A D I E P U L C ANY QUESTIONS??? American shad Alosa sapidissima, most delicious Hickory shad Alosa mediocris, ordinary Blueback herring Alosa aestivalis, arrives in spring
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