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- W3090427640 abstract "Aging Antarctic icefish is difficult because of their lack of scales and poorly calcified bones. Icefish ages must therefore be estimated from otoliths. We describe a method of reading daily micro-increments in connection with shape, size and mass analyses of the otoliths of the South Georgia icefish Pseudochaenichthys georgianus . Changes in otolith morphology and mass correlate with fish size and age group. The otolith micro-increment analysis is capable of establishing the age of an icefish by relating the daily micro-increment count to the life history of the fish. Micro-increment measurements and analyses are relatively simple to do by light and scanning electron microscopy and by using micro-densitometer and digitizing equipment. Drastic changes in the life history of an individual are reflected by measurable changes in its otolith micro-increment data as seen in our analyses of age groups 0-VI. The initial drastic change in daily micro-increment shapes and periodicities occur in connection with the hatching period of the icefish. The next drastic change in otolith shape and daily micro-increments occurs when ~7 cm long fish shift from pelagic to benthic habitats. As the fish age beyond group III, individual otolith variability lessens until they begin spawning. Our results indicate a single population of P. georgianus between the Antarctic Peninsula and South Georgia." @default.
- W3090427640 created "2020-10-08" @default.
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- W3090427640 date "2021-01-14" @default.
- W3090427640 modified "2023-09-27" @default.
- W3090427640 title "Age determination in the icefish Pseudochaenichthys georgianus (Channichthyidae) based on multiple methods using otoliths" @default.
- W3090427640 cites W2116263760 @default.
- W3090427640 doi "https://doi.org/10.3354/ab00736" @default.
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