CONSERVATION" OF THE HALIBUT THOMPSON 



371 



Table 2. — Poundage of fish stock surviving each year from a 90-pcrcent annual 



catch (see p. 372) 



Tables. — Poundage of fish stock surviving each year from an 80-percent annual 



catch {see p. 312) 



Table 4.^ Rate of groivth of Goose Island male and female halibut 



Male 



Length 



Weight 



Female 



Length 



Weight 



Male and Female 



Length 



Weight 



4 years - 



5 years. 



6 years - 



7 years. 



8 years. 



9 years. 



10 years 



11 years 



12 years 



13 years 



14 years 



15 years 



16 years 



17 years 



Inches 

 21.7 

 23.2 

 25.0 

 26.6 

 28.3 

 29.9 

 31.7 

 33.5 

 35.0 

 36.8 

 38.4 

 40.1 

 41.7 

 43.5 



Pounds 



4.0 



4.8 



5.9 



7.1 



8.8 



10.6 



12.4 



14.5 



16.8 



19.6 



22.2 



25.3 



28.5 



32.5 



Inches 

 22.2 

 24.2 

 26.4 

 28.3 

 30.3 

 32.5 

 34.4 

 36.4 

 38.4 

 40.5 

 42.5 

 44.5 



Pounds 

 4.2 

 5.5 

 7.1 

 8.8 

 11.0 

 13.4 

 15.9 

 18.9 

 22.2 

 26.2 

 30.2 

 34.8 



Inches 

 2L9 

 23.7 

 25.5 

 26.6 

 28.8 

 30.0 

 32.8 

 34.4 

 35.7 

 37.8 

 40.4 

 42.6 



Pounds 

 4.1 

 5.1 

 6.2 

 7.6 

 9.4 



n.3 



13.7 

 15.9 

 17.9 

 21.4 

 26.2 

 30.7 



> From H. A. Dunlop, unpublished manuscript. Measurements are average. 



Let us now take the first case, in which the two balance. The 

 fishermen might take their 4,000 pounds all in any one year, but as 

 a matter of actual practice they do not; they take but a certain 

 percentage annually. Yet, since the decrease in numbers is balanced 

 by growth, they ultimately secure the full 4,000 pounds from each 

 year class of fish. 



36923—30 25 



