| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Outline of Final Research Achievements |
We developed a simple measurement system of spectral light absorbance of piece of retina containing different types of photoreceptors by using a standard portable spectrophotometer and wide spectrum LED. The system was verified by comparing a known protoreceptor’s absorbance spectrum and it was concluded that this system (method and device) can be a quick and portable assessment tool for evaluating the spectral sensitivity of fish retinae. In this study, a total of 10 species retinae were measured including target species of light fishing, such as Japanese anchovy and jack mackerel, and other fishery important species. Peaks of absorbance of retinae showed differences by their habitat; peak absorbance of coastal fishes appeared >500 nm while offshore and deep water species had <500 nm. A spread worksheet by which evaluates light efficiencies of various wavelength of fishing light to vision of target species was made and has been tested by a maker company of fishing light.
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