these links may be useful

Article Chemistry to conservation: Using otoliths to advance recreat...

https://swfsc.noaa.gov/publications/cr/1985/8581.pdf

https://www.karger.com/Article/Pdf/213580

http://jifro.ir/files/site1/user_files_eb12be/eng/fallahi-A-10-1272-37-e71dd69.pdf

Generally, I think ageing freshwater fish in Asia using otolith is as similar as ageing those in other continents. It is more important which fish species, or up to family you are interested. Also to which level you would like to age, yearly or daily? Asia is a large region, including cold arctic to hot tropical weather. However, inmy experience, the otoliths generally show clear annuli even in the tropics, and this book is a good reference: " Tropical Fish Otoliths: Information for Assessment, Management and Ecology". My publication, also shows one "freshwater" fish, Anguilla japonica, has deposited rings in a yearly rhythms. There are also numerous papers about the confirmation of daily rings. Use keywords with fish scientific name + otolith + annuli (or daily age), you should be able to find tons of them.

Dear Anne,

here are some papers you might want to check out - they are not necessarily about Asian fish but that should not matter much:

Buratti, C.C., Santos, B.A., 2010. Otolith microstructure and pelagic larval duration in two stocks of the Argentine hake, Merluccius hubbsi. Fisheries Research 106, 2–7. https://doi.org/10.1016/j.fishres.2010.05.007

Engstedt, O., Stenroth, P., Larsson, P., Ljunggren, L., Elfman, M., 2010. Assessment of natal origin of pike (Esox lucius) in the Baltic Sea using Sr:Ca in otoliths. Environ Biol Fish 89, 547–555. https://doi.org/10.1007/s10641-010-9686-x

Parisi-Baradad, V., Manjabacas, A., Lombarte, A., Olivella, R., Chic, O., Piera, J., Garcoea-Ladona, E., 2010. Automated taxon identification of teleost fishes using an otolith online database--AFORO. Fisheries Research 105, 13–20. https://doi.org/doi: DOI: 10.1016/j.fishres.2010.02.005

Soliman, V.S., Yamada, H., Yamaoka, K., 2010. Early life-history of the spiny siganid Siganus spinus (Linnaeus 1758) inferred from otolith microstructure. Journal of Applied Ichthyology 26, 540–545. https://doi.org/10.1111/j.1439-0426.2010.01478.x

Spurgeon, J.J., Pegg, M.A., Halden, N.M., 2018. Mixed-origins of channel catfish in a large-river tributary. Fisheries Research 198, 195–202. https://doi.org/10.1016/j.fishres.2017.09.001

Wang, N., Eckmann, R., 1992. Effects of photoperiod, feeding regime and water temperature on the formation of daily growth increments in otoliths of larval pike (Esox lucius L.). Journal of Applied Ichthyology 8, 246–250. https://doi.org/10.1111/j.1439-0426.1992.tb00690.x

Yukami, R., Aoki, I., Mitani, I., 2008. Daily age of adult japanese anchovy Engraulis japonicus off eastern Honshu, Japan by otolith daily increment. Fisheries Science 74, 1348–1350. https://doi.org/10.1111/j.1444-2906.2008.01665.x

Best,

Peter

Thank you for your answers. I'm working on Cyrpinidae in a sub-tropical country in Southeastern Asia. I search more specially articles in the same Region in order to compare the results (annuli formation period on the year). Again thank for your answers.

Go to GOOGLE there you can find many relevant papers it is all based on microscopical observations through microscopes or binocular on 3d preparate or cut and polished sections

There is a book on age and growth of fishes from the American Fisheries Society that may be worth exploring. There is a chapter on "Validation of Annual and Daily Increments in Calcified Structures and Verification of Age Estimates" that sounds like it would be of interest.

https://fisheries.org/bookstore/all-titles/professional-and-trade/55078c/

These attached pdf may be useful

You can check this.

Article Assessment of growth zones on whole and thin-sectioned otoli...