Vaughan, Douglas S. and Smith, Joseph W.
Stock assessment of the Atlantic menhaden,
Brevoortia tyrannus, fishery.
NOAA/National Marine Fisheries Service,
(NOAA Technical Report NMFS, 63)
A stock assessment of the Atlantic menhaden, Brevoortia tyrannus, fishery was conducted with purse-seine landings data from 1940 to 1984 and port sampling data from 1955 to 1984. These data were analyzed to determine growth rates,
maximum sustainable yield (MSY), spawner-recruit relationships, and yield per recruit. Virtual population analysis was used to estimate stock size, year class
size, and fishing mortality rates.
Surplus production models produced estimates of MSY from 450 to 490 kmt compared with yields of 416to 436 kmt based roughly on maximum recruitment from a weak spawner-recruit relationship. Recruitment to age-I ranged from 1.2 to 14.8 billion fish for year classes 1955-81. Recent mean recruitment to age-I for the 1975-81 year classes averaged 5.7 billion fish and compared favorably with the mean of 7.7 billion age-I fish recruited during the late 1950's. Mean recruitment from recent years suggests possible coastwide yields of 416 to 481 kmt. Continued dominance of late age-2 spawners among the spawning stock is of concern, since the stock is at greater risk through poor recruitment if recent favorable environmental conditions change.
Yield-per-recruit estimates ranged from 46 g to 59 g since 1970. The high dependency of the modern fishery on prespawners has increased concerns about fluctuations in year-to-year availability and catches. To increase yield and enhance the stability of the resource, the number of age classes contributing significantly to the fishery should be increased, creating a butTer against future poor
recruitment years and lessening the year-to-year fluctuations in landings. (PDF file contains 24 pages.)
Monograph or Serial issue
||Stock assessment of the Atlantic menhaden,
Brevoortia tyrannus, fishery
|Vaughan, Douglas S.|
|Smith, Joseph W.|
||NOAA Technical Report NMFS
||NOAA/National Marine Fisheries Service
||United States National Marine Fisheries Service
Patti M. Marraro
||04 Nov 2009 21:58
||29 Sep 2011 18:25
Actions (login required)