Species:

Brevoortia tyrannus

Common Names:

Atlantic Menhaden, Fatback, bugfish, Bunker

Family

Clupeidae (Herrings, shads, sardines, menhadens)

Order:

Clupeiformes

Description:

Body deep and compressed, 30-35 scutes apparent along belly. Silvery, with brassy sides and a dark bluish green back. Upper jaw with distinct median notch, no teeth. Pelvic fin with rounded hind margin, inner finrays equal or nearly equal to outer finrays when fin folded back. Dorsal spines (total): 0-0; Dorsal softrays (total): 18-22; Anal spines: 0-0; Anal soft-rays: 18-24. Pre-dorsal scales modified; scales in lateral series 40 to 58 (usually about 45 to 52), those on back, above base of anal fin and at base of tail much smaller and irregularly placed. A black spot behind gill opening, followed along flank by a variable number of smaller spots forming up to 6 approximate lines. Peritoneum is black. Easily distinguished from B. smithi, which has 54 to 80 (usually about 60 to 70) scales and no lines of spots on flank. Other Brevoortia species do not overlap in range. Other clupeids lack the modified pre-dorsal scales. Maximum size 50.0 cm Total Length (male/unsexed).   

Fishery Status:

  • Value

  • Annual Harvest

fisheries: highly commercial

The menhaden fishery is one of the most important and productive fisheries on the Atlantic coast, providing fish meal, fish oil and fish solubles and bait for other fisheries. Prior to 1989, more pounds of menhaden were landed each year than any other fish in the United States with coast-wide landings ranging from 300,000 to 400,000 metric tons since the mid-1970s. A majority of catches come from estuaries and near-shore coastal waters, and are caught with a variety of gear, purse seines and pound nets being the most common. The menhaden purse-seine fishery has been found to be an extremely clean fishery, taking less than one percent incidental catch of other species.

The menhaden stock is considered healthy, with total stock size and recruitment comparable to levels recorded during the late 1950s and early 1960s. The Atlantic Menhaden Advisory Committee recommended that no further restrictions on fishing are necessary to manage the fishery, although recreational fishing interests and some conservation groups in the Chesapeake Bay are concerned that low recruitment of menhaden may be affecting the species’ ability to serve as a major food source for other fish. Stock biomass is currently high, but likely to decline in the next few years due to low recruitment. Studies indicate that environmental conditions are likely more important than spawning stock size in determining reproductive success, although there is a weak spawner-recruit relationship.

Predators:

favorite food in great numbers for striped bass, bluefish, seatrouts, tunas and sharks

Prey/Food source:

Phytoplankton & Zooplankton

Life History:

Sexual maturity begins just before age three, and these fish spawn from March to May, and again in September and October. Larvae of .4-1.3 inches appear in the Chesapeake Bay in large numbers during May and June, with a smaller influx in November. The larvae use the brackish waters and fresh waters as nursery areas. Here they metamorphose into juveniles and grow rapidly. By the fall, the young menhaden quadruple in size to reach 1.6 inches to 7.3 inches. The young-of-the-year leave the estuary in late fall and join the schools in southward migration. Menhaden reach a maximum length of 15 inches, feeding on both phytoplankton and zooplankton. In their well-nourished state, these filter feeding fish are referred to as fatbacks or bunkers and then serve as prey for the other fish and sea birds. A large crustacean parasite also commonly feeds off of the menhaden, attaching to the fish’s mouth, earning it another nickname: bugfish.
Menhaden are common in all salinities of the Chesapeake Bay, swimming in large schools close to the water’s surface during the spring, summer and fall. Migrate north/south; also in and out of bays and inlets. Individuals swim in close schools and follow a single fish for a period, after which the leader drops back and another takes over. Throughout the spring, the schools stratify by size and age along the coast so that by the summer, younger and smaller fish are found in Chesapeake Bay and south while the older, larger fish are distributed to the north. During the fall and early winter, most menhaden migrate south to the North Carolina capes, where they remain until March and early April.

Habitat & Range:

Found inshore in summer, but at least some moving into deeper water in winter. Adults are found in near surface waters, usually in shallow areas overlying continental shelf, in greatest abundance immediately adjacent to major estruaries. Juveniles are also generally pelagic, with smallest size groups farthest up river. Water: brackish; marine; pH range: 1.0 - 36.0 ; depth range - 20 m, Range: Western Atlantic: Nova Scotia, Canada southward to Indian River, Florida, USA.  Climate: subtropical; 26.0°C; 45°N - 25°N

Links: http://noaa.chesapeakebay.net/spc/menhaden.htm

Main Reference: