by 1 month, i.e., beginning February 1 and 

 ending January 31 of the following year (Clark 

 and Dreyer, 1961). The seasons of the "had- 

 dock year" are composed of 3-month periods 

 with February through April for spring, May 

 through July for summer, and so forth. 



The market categories for haddock are 

 "large" and "scrod." Large haddock weigh 

 more than 2 1/2 pounds (gutted), and scrod 

 haddock weigh 1 1/2 pounds to 2 1/2 pounds 

 (gutted). Fish smaller than this are called 

 "snapper haddock" if brought in to be sold, 

 or "undersized haddock" when they are dis- 

 carded at sea as being too small for com- 

 mercial purposes. 



Length frequency samples were taken only 

 from haddock caught by vessels which fished 

 in a clearly defined statistical division (such 

 as east Georges Bank). A sample consists of 

 measurements of 100 large haddock or 50 

 scrod randomly selected from the catch of a 

 vessel. 



Scale samples for the age frequency data 

 were collected by sampling the entire range 

 of sizes equally. Scales were taken from 20 

 large haddock or 15 scrod per sample. 



Reference in the tables to "actual pounds 

 landed in thousands" means the total pounds 

 of haddock landed for each market category 

 in the United States for the statistical areas 

 mentioned. The manipulation of the sample 



data to obtain the "estimated numbers in 

 thousands" has been described by Clark and 

 Dreyer (1961). 



LITERATURE CITED 



CLARK, JOHN R., and FRANK A. DREYER. 



1961. Biostatistics of the New England 

 haddock fishery, 1956. U.S. Fish and 

 Wildlife Service, Special Scientific Re- 

 port — Fisheries No. 375, 89 p. 



McCANN, JAMES A., and FRANK A DREYER. 



1962. Length and age frequency samples 

 collected from Georges Bank haddock 

 landings, 1931-55. U.S. Fish and Wild- 

 life Service, Special Scientific Report — 

 Fisheries No. 430, p. 



ROUNSEFELL, GEORGE A. 



1948. Development of fishery statistics in 

 the North Atlantic. U.S. Fish and Wild- 

 life Service, Special Scientific Report 



No. 47, 18 p. 



1957. A method of estimating abundance 

 of groundfish on Georges Bank. U.S. 

 Fish and Wildlife Service, Fishery Bul- 

 letin 113, vol. 57, p. 265-278. 



SCHUCK, HOWARD A. 



1951. Studies of Georges Bank haddock. 

 Part I: Landings by pounds, numbers, 

 and sizes of fish. U.S. Fish and Wild- 

 life Service, Fishery Bulletin 66, vol. 

 52, p. 151-176. 



