摘要:

This paper describes a computer programme for the estimation of the size of exploited populations by methods described in Allen (1966, J. Fish. Res. Bd. Canada 23: 1553–1574). Although these methods were originally developed for use on whale populations, they are applicable to any other populations where suitable data are available. The essential data are the total catch, the catch for a known amount of effort, and the age distribution of the catch, all for a series of years. An estimate of natural mortality rate is also required but population estimates may be obtained for up to 10 values of this parameter in a single computer run.The entire programme incorporates six subroutines, as well as the main controlling programme. One subroutine reads in the catch and effort data, a second reads in the age distribution data for each year and, if necessary, converts it according to a predetermined transformation from age expressed in terms of whale ear-plug laminations to age in years. The third subroutine estimates the rate of recruitment as the proportion of newly recruited animals in the catch for each year, using the method of Allen (1966). The other three subroutines derive population estimates, using the "q," modified DeLury, and actual and expected catch methods (Allen, 1966). As many sets of data as desired may be processed in a single computer run.

ISSN:0706-652X    

DOI:10.1139/f69-021

出版商:NRC Research Press    

年代:1969

数据来源: NRC

摘要:

Under western Canadian conditions infestation ofMytilicola orientalishas little economic significance in commercial oyster production. First record of natural infestation ofSaxidomus giganteusis given.

ISSN:0706-652X    

DOI:10.1139/f69-022

出版商:NRC Research Press    

年代:1969

数据来源: NRC

摘要:

Percentage sinistrality in the starry flounder (Platichthys stellatus) off British Columbia was found to increase proceeding from south to north, and on the average (66%) was greater than that found off the western coast of the United States, and close to that found off Alaska.

ISSN:0706-652X    

DOI:10.1139/f69-023

出版商:NRC Research Press    

年代:1969

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f69-024

出版商:NRC Research Press    

年代:1969

数据来源: NRC