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Fish see color, shine, and line thickness: understand when fluoro really helps, when thin mono wins, and why a long leader and a well-tied knot make a difference. CHECK OUT THE BEST ALIEXPRESS PRODUCTS SHOWN IN THE VIDEOS! ONLY THE SELECTION APPROVED BY YAMA! https://loja.quersaberdeixacomigo.com.br Become a member of this channel and get benefits:    / @qsdcpescarianoaltomar   IMPORTANT! From the O MESTRE members group, send an email to [email protected] if you want to join the WhatsApp group. DOWNLOAD THE FREE E-BOOK WITH IMPORTANT LESSONS FROM YAMA BY VISITING OUR WEBSITE! https://www.quersaberdeixacomigo.com.br SHARE YOUR STORY [email protected] FOLLOW US ON INSTAGRAM @quersaberdeixacomigo 1) Visibility depends on contrast (turbidity/scattering reduces visual range) Nieman et al., 2018 (J. Exp. Biol.) – detection thresholds under algal vs. sedimentary turbidity; algal turbidity reduces vision more. https://pmc.ncbi.nlm.nih.gov/articles... Nieman et al. (NOAA repository) – same research with NTU numbers by turbidity type and species. https://repository.library.noaa.gov/v... Lee et al., 2015 (Remote Sensing of Environment) – Mechanistic Secchi depth model for underwater visibility. https://www.sciencedirect.com/science... Liu et al., 2019 (MDPI – Remote Sensing) – Secchi estimates in very turbid water (Taihu), linking transparency to detection. https://www.mdpi.com/2072-4292/11/19/... Gallegos, 2011 (J. Geophys. Res.) – Long time series of scattering/attenuation versus Secchi in an estuary. https://agupubs.onlinelibrary.wiley.c... Professional Plastics 2) Fluorocarbon ≠ invisible, only reduces refraction (refractive indices) IAPWS R9-97 – official formulation of the refractive index of water as a function of λ, T, and ρ (≈ n ~1.333 in the visible at 20–25°C). https://iapws.org/documents/release/R... NIST (Harvey, 2024, chap. CRC) – tables of n for water from IAPWS (laboratory values). https://www.nist.gov/publications/ind... PDF: https://tsapps.nist.gov/publication/g... Arkema (Kynar® PVDF) – PVDF ~1.40–1.42 (ASTM D542) in official data sheets. Page: https://hpp.arkema.com/en/product-fam... Brochure PDF: https://page.arkema.com/rs/253-HSZ-75... Other PDF (applies to wire/cable): https://www.arkema.com/files/live/sit... Nylon/Polyamide (typical references ~1.52–1.53**)** Professional Plastics – properties table (PA6/PA66 with nD ~1.53). https://www.professionalplastics.com/... 3) Diameter usually outweighs the material (in non-crystalline water). Theoretical basis: The same visibility/contrast studies above (Secchi/turbidity) explain why apparent cross-section (diameter) dominates when there is scattering – use Nieman 2018 and Lee 2015 for reference. 4) Color and brightness matter (underwater spectrum and surface reflection). NOAA Ocean Service – penetration depth by color; red disappears shallower, blue reaches deeper. https://oceanservice.noaa.gov/facts/l... NOAA Ocean Exploration – Light & Color – technical brochure: absorption of reds/oranges and increased range of blue. https://oceanexplorer.noaa.gov/wp-con... “Science of Light” guide: https://oceanexplorer.noaa.gov/wp-con... 5) Many fish have UV cones/polarization vision (changes “what appears”) Losey, 1999 (J. Fish Biol., UQ eSpace) – classic review on UV vision in fish. https://espace.library.uq.edu.au/view... Sport Fishing Hawryshyn, 2000 (Proc. R. Soc. B) – UV polarization in fish. https://pmc.ncbi.nlm.nih.gov/articles... Kamermans & Hawryshyn, 2011 (Phil. Trans. B) – How polarization vision can work and what it is for. https://pmc.ncbi.nlm.nih.gov/articles... Mitchell et al., 2024 (J. Exp. Biol.) – UV improves color discrimination in anemonefish (behavioral evidence). https://journals.biologists.com/jeb/a... PMC: https://pmc.ncbi.nlm.nih.gov/articles... 6) Water condition matters (high clarity = material/index count more) Return to the Secchi metric and scattering/attenuation studies to justify the rule of thumb: high clarity ⇒ material/index and finish count; low clarity ⇒ diameter/presentation dominate. (Lee 2015; Liu 2019; Gallegos 2011; NOAA) https://www.sciencedirect.com/science...