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Little Fish That Big Fish Angler’s Almanac ou might be surprised to learn that the most Why so short, with so few feathers? Look Yabundant fish species in the Chesapeake Bay closely at a bay anchovy and you’ll understand. and its tidal rivers is not the Atlantic menha- It pays to study the prey that our favorite fish den—though they are very important too, and favor; talk with Harkers Island veterans and we’ll get to them shortly. No, the top honor they’ll tell you how picky false albacore can be actually goes to the bay anchovy (Anchoa about the length of their flies. Matching the mitchelli), also known as a glass minnow or hatch still counts, though the gaudy green- “rain bait.” No doubt you’ve seen them—nearly yellow color scheme can help to attract the transparent 2- to 3-inch fish, schools of which fishes’ attention in cloudy water. dimple the surface of the water like Forage Fish Play Key Roles in VIMS Juvenile Survey Trawl Little Fish That raindrops (hence the Chesapeake nickname number A quick lesson on the Chesapeake’s food web: crabs. Oysters aren’t normally considered fish tion size extensively. The Atlantic States Marine ABOVE: A tiny bay anchovy. Big Fish Eat two). This little fish The energy that drives the system comes first food, but there are some big “crunchers” in the Fisheries Commission (ASMFC) and its OPPOSITE PAGE: Joe Bruce’s bay has a long lower jaw from the sun, though it has to be converted to Bay, especially tautogs, sheepshead and member states (Maine to Florida) have anchovy y. They may be tiny and nearly under a bullet-shaped carbohydrates, proteins, fats and oils. And doing cownose rays, that are perfectly capable of coordinated management plans for them. nose. That jaw swings most of that work are phytoplankton, micro- eating algae-fueled oysters. It’s the copepod, (That process is going through a watershed invisible, but tiny fish like bay down to reveal a scopic single-cell plants that drift in the water however, that leads us to the bay anchovy—as change over the next six months; for more on anchovies and silversides are surprisingly large column); underwater grasses, like eelgrass and well as the Atlantic silverside (the second most that, see the Tackle Box, page 46, and the critical links in the food chain. mouth—which is wild celery; marsh plants, like wild rice and abundant fish species) and menhaden (yes, feature article “Food Fight” in last month’s telling. It’s actually a saltmarsh cordgrass; and tree leaves that fall or the third). issue, for more information). By John Page Williams ferocious mini-preda- wash into the waters. Roughly speaking, it takes five thousand Up till now, though, the primary goal of tor, feeding ravenously The next stage is tiny animals that “graze” pounds of phytoplankton to make five hundred menhaden management has been to maximize on zooplankton, especially tiny crustaceans on the live plant material, or those that munch pounds of copepods, which gives you fifty the harvest for bait and industry, but research called copepods. on it when it is decaying. Many of the tiny pounds of bay anchovies, which gives you one into the Chesapeake ecosystem has led ASMFC Anglers who make the annual fall trek to grazing animals are crustaceans of a group five-pound Spanish mackerel, bluefish or to begin considering their ecological roles as Harkers Island, North Carolina, for false called copepods, one species of which may be rockfish. Fortunately, phytoplankton come by essential links between plankton and preda- albacore are quite familiar with these ancho- the Bay’s most abundant animal species. the billions per gallon of Bay water. tors—both fish and birds like ospreys and vies. They tie flies to imitate them: small, Another, much larger grazer is native American There’s a balance to be struck, though. Too loons. The new management regime will slender and translucent, with big eyes and a oyster, which feeds by filtering Bay water heavy a bloom of algae can cause serious firmly factor in that role. little bit of flash down the sides. Another lure through its gills, catching certain kinds of algae problems, especially by causing the dead As the commission does so, its member that imitates them well up and down the Bay, there, and transferring them to its mouth. zones of low dissolved oxygen that plague the states are also beginning to pay increased especially in the fall when the population Meanwhile, the dead-plant munchers include a Bay and its tributaries for the warmer half of attention to the ecological roles of other forage peaks, is a short, sparse, small feather jig with dozen or more species of marine worms, a each year. Excessively fertile water (too much species like bay anchovies and silversides, even 1 a /8-ounce head cast on a 1/0 hook. The dozen or more species of mud crabs and small nitrogen and phosphorus) is the root of the though there is no market for them. Thus both obvious color scheme is a white head tied crustaceans like grass shrimp. oxygen problem, but it can also cause changes the Virginia Institute of Marine Science’s with four to six 2-inch white and yellow neck Remember, though, that the plants come in to the species mix of the phytoplankton Fisheries Department (VIMS) and the Maryland hackle tips. Another that works very well, even a vast array of sizes, shapes and flavors. Like community, which in turn can wreak havoc Department of Natural Resources Fisheries though it looks nothing like an bay anchovy, is us, the grazers have developed strong food with the diets of filter-feeding shellfish like Service (DNR) include them in their annual a chartreuse green head with fluorescent preferences, dictated by the structures of their oysters and finfish like menhaden. Both seine surveys (see the Tackle Box for web yellow feathers. mouths, their capturing abilities, and their problems put significant stress on the popula- links). The survey numbers for anchovies in digestive capabilities. There are enough tions of our forage fish, which of course cause Maryland have been low for the last 20 years, variations in this step to keep a legion of problems with their predators. Bay scientists, possibly because of the low oxygen conditions biologists busy for their entire careers, but the for example, think that the low stock of that still plague the Bay in summer. The bottom line is that these grazers and munchers menhaden (currently estimated at 8 percent of anchovy numbers have improved in the last form a hugely important link at the base of the what it might be if they weren’t harvested, is couple of years, however, in both Maryland Chesapeake’s food web. causing nutritional stress and weakness in and Virginia. So what is the next step? How does the young rockfish in the Chesapeake, which The same pattern holds true in both solar energy make it from these grazers and leaves them open to infections from fungi, states for silversides, which look similar but munchers to predator fish? In the case of grass mycobacteria and other diseases. are generally a little longer than anchovies, shrimp, the answer is obvious to anyone who Menhaden have high commercial value for with pronounced silver stripes and green has ever fished with them as bait. In the Bay, bait and industrial uses, so scientists have backs. They are more common close to they have about as many “friends” as soft studied their migratory behavior and popula- shore, and their mouths are smaller, located 44 CHESAPEAKE BAY MAGAZINE June 2012 ChesapeakeBoating.net ChesapeakeBoating.net CHESAPEAKE BAY MAGAZINE June 2012 45 Angler’s Almanac ou might be surprised to learn that the most Why so short, with so few feathers? Look Yabundant fish species in the Chesapeake Bay closely at a bay anchovy and you’ll understand. and its tidal rivers is not the Atlantic menha- It pays to study the prey that our favorite fish den—though they are very important too, and favor; talk with Harkers Island veterans and we’ll get to them shortly. No, the top honor they’ll tell you how picky false albacore can be actually goes to the bay anchovy (Anchoa about the length of their flies. Matching the mitchelli), also known as a glass minnow or hatch still counts, though the gaudy green- “rain bait.” No doubt you’ve seen them—nearly yellow color scheme can help to attract the transparent 2- to 3-inch fish, schools of which fishes’ attention in cloudy water. dimple the surface of the water like Forage Fish Play Key Roles in VIMS Juvenile Survey Trawl Little Fish That raindrops (hence the Chesapeake nickname number A quick lesson on the Chesapeake’s food web: crabs. Oysters aren’t normally considered fish tion size extensively. The Atlantic States Marine ABOVE: A tiny bay anchovy. Big Fish Eat two). This little fish The energy that drives the system comes first food, but there are some big “crunchers” in the Fisheries Commission (ASMFC) and its OPPOSITE PAGE: Joe Bruce’s bay has a long lower jaw from the sun, though it has to be converted to Bay, especially tautogs, sheepshead and member states (Maine to Florida) have anchovy y. They may be tiny and nearly under a bullet-shaped carbohydrates, proteins, fats and oils. And doing cownose rays, that are perfectly capable of coordinated management plans for them. nose. That jaw swings most of that work are phytoplankton, micro- eating algae-fueled oysters. It’s the copepod, (That process is going through a watershed invisible, but tiny fish like bay down to reveal a scopic single-cell plants that drift in the water however, that leads us to the bay anchovy—as change over the next six months; for more on anchovies and silversides are surprisingly large column); underwater grasses, like eelgrass and well as the Atlantic silverside (the second most that, see the Tackle Box, page 46, and the critical links in the food chain.
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