Abstract
The tagged ratio method already introduced by the Author, was applied to the tag-recapture data of Japanese common goby, Acanthogobius flavimanus in the northern part of Tokyo bay, from 1955 to 1959. The results showed that the population size of this goby in the area were about 1 ?? 2 hundred millions at the period from middle of September to beginning of October, though of course there were some yearly variation. Otherwise, the results obtained by common PETERSEN method, based on the same data, were clearly overestimates, caused by the successive diminution of tags. The average value of weekly natural mortality coefficient, obtained by the tagged ratio method and BEVERTON method together, was about 0.0519 at the prime fishing season from middle of September to beginning of November in this area. Furthermore, 0.10 ?? 0.20 for the exploitation rate, (1×10-6 for the catchability coefficient), and 0.60 ?? 0.70 for the survival rate during same period, were calculated respectively.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
