Growth of released abalones Haliotis discus hannai in the coastal waters of Uozu city, Toyama Prefecture
2018
Iida, N. (Fisheries Research Institute, Toyama Prefectural Agricultural Forestry and Fisheries Research Center, Namerikawa, Toyama (Japan)) | Urabe, S.
Age and growth of hatchery-reared Ezo abalone Haliotis discus hannai caught in the coastal waters of Uozu City, Toyama Prefecture were analyzed by observing the annual rings on the shell of 92 recaptured individuals. Landed Ezo abalone which had a green mark on the apex of the shell were identified as hatchery-reared individuals. Abalone recaptured from 2004 to 2011 were used for the growth and age analyses. The growth was expressed by von Bertalanffy equation given as Lsub(t) = 131.5 (1-expsup(-0.292(t-0.403))), where t is age and Lsub(t) is shell length (mm) at age t. The present results show that released Ezo abalone were mainly caught at 6-8 years old, 4.5-6.5 years after release.
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