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A Method to Decipher the Life History of Fish from its Eyeballs Recorded since its Juvenile Stage | |
admin | |
2022-02-04 | |
发布年 | 2022 |
语种 | 英语 |
国家 | 日本 |
领域 | 资源环境 |
正文(英文) |
February 4, 2022
JAMSTEC Atmosphere and Ocean Research Institute, The University of Tokyo Japan Fisheries Research and Education Agency (FRA) A Method to Decipher the Life History of Fish from its Eyeballs Recorded since its Juvenile Stage1. Key Points
2. OverviewIn collaboration with Professor Shin-ichi Ito of the Atmosphere and Ocean Research Institute at the University of Tokyo and Principal Investigator Michio Yoneda of Japan Fisheries Research and Education Agency, Researcher Yota Harada, Director Naohiko Ohkouchi, and their colleagues at the Biogeochemistry Research Center of the Research Institute for Marine Resources Utilization at the Japan Agency for Marine-Earth Science and Technology developed a method to study the ecology of fish from its crystalline lens. The aim for the sustainable use of marine resources necessitates a thorough understanding of the ecology of marine organisms. However, our knowledge of the ecology of marine organisms remains insufficient compared to that of the ecology of terrestrial organisms. Observation of marine organisms, such as fish, is challenging as they move through vast, three-dimensional oceanic spaces over long distances. Bio-logging, a method of attaching a GPS or other recording devices to fish, has been widely used in recent years. Nevertheless, such methods have limitations based on the size of the fish and the battery life. To overcome these limitations, the current study developed a method to analyze fish ecology using the crystalline lens of their eyeballs. The crystalline lens of a fish eyeball begins forming in the egg. The lens grows incrementally by forming new layers, such as how trees add growth rings annually, and these are retained throughout their lives. Thus, the growth layers can be collected in chronological order, in a manner like peeling an onion skin (Video 1). The crystalline lens contains an amino acid called phenylalanine, which can only be acquired through feeding. Analyzing the nitrogen isotope ratios therein could likely allow the distribution and trophic history of fish to be estimated . In this study, we used crystalline lens analysis to investigate the typical migration pattern of chub mackerel. We predicted that these fish had spent their larval stage in subtropical waters with a low nitrogen isotope ratio (off the Izu Peninsula) and moved to the subarctic waters with a high nitrogen isotope ratio (off the coast of Sanriku) as they grew. (Figs. 1 and 2). The method developed in this study can be applied to almost all marine organisms with crystalline lenses, and it is expected to play an important role in marine ecological research and fisheries resource management. The findings of this study published in Frontiers in Marine Science on February 3, 2022 (Japan time).
Title:Compound-specific nitrogen isotope analysis of amino acids in eye lenses as a new tool to reconstruct the geographic and trophic histories of fish Fig.1 (a) Cross-section of the crystalline lens of a chub mackerel. Growth layers formed in a manner similar to the annual growth rings of trees. (b) Crystalline lens sample collected per growth layer. (The images were taken using a [type of] microscope (model, brand/supplier, City, Country) Fig. 2 Time-series analysis of the nitrogen isotope ratio in the growth layers of the crystalline lens collected from two chub mackerel individuals (separate data in black and gray). (a) Total and phenylalanine nitrogen isotope ratios. The nitrogen isotope ratios of phenylalanine, which is one of the most difficult amino acids for a fish to synthesize, provide information on sources of food that that the fish had eaten. (b) Nutritional stages are estimated from amino acid nitrogen isotope ratios. (c) The growth stage represented by the crystalline lens layer sampled could be estimated using the correlation between the radius of the lens, fork length, and age of the fish in days. Contacts:
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来源平台 | Japan Agency for Marine-Earth Science and Technology |
文献类型 | 新闻 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/346257 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | admin. A Method to Decipher the Life History of Fish from its Eyeballs Recorded since its Juvenile Stage. 2022. |
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