문어낚시, 같은 날 7마리 vs 100마리. 대체 무슨차이?

Same day, same tackle, same skill. One boat caught 7 fish, the other 100. What made the difference? The answer lay not on the surface of the sea, but on the seabed. Based on research papers, I will illustrate what happens on the seabed during the summer by depicting the underwater environment. I also confirmed whether that feeling of "they only bite at dawn" is due to oxygen. ⏱ Chapter 0:00 On the Same Day, 7 vs 100 0:39 The Summer Sea Divides Up and Down 1:26 They're Not Dead, They Just Don't Bite 2:03 There Are People Who Actually Measured It 2:49 Why Does Flowing Water Live? 3:12 "The Water Is Dead" Means Two Things 3:47 Flow = The Path of Smells 4:27 The Real Reason They Bite at Dawn 5:20 The World's Oceans, the Same Rules 6:03 A Single Oxygen Map 6:27 If the Water Differs Even Within the Same Neighborhood 6:44 When It Opens Again 7:00 As the Sea Gets Hotter 7:40 Today's Summary 📚 Sources (All content indicated on screen) · Cerezo Valverde & García García (2005) Aquaculture 244:303-314 — Optimal Dissolved Oxygen for Octopuses (Optimal 100~65% Saturation / Critical 31.6% = 2.3 mg/L / lethality 11%). Experimental species = European octopus Octopus vulgaris, respiration measurements in aquaculture tank. · Animal Biotelemetry (2024) 12:16 — Acoustic tracking of 24 wild octopuses for 150 days (Galicia, Spain). Dark-dark-motility = Double peak at 5 a.m. and 6 p.m. https://doi.org/10.1186/s40317-024-00... · Weertman et al. (2025) PLOS ONE — Odor-gated rheotaxis of octopuses. Experimental species Octopus rubescens, flow velocity in a dark tank 2 cm/s. https://doi.org/10.1371/journal.pone.... · Gleadall (2016) Species Diversity 21(1):31-42 — Korean common octopus = Octopus sinensis. A different species from the European octopus (O. vulgaris). · US EPA CADDIS — Diurnal minimum of dissolved oxygen = just before sunrise, directly above sediment. · National Institute of Fisheries Science (2025-10-31) — Definition of oxygen-deficient water mass: "A water mass that occurs in the bottom layer when the temperature difference between the surface and bottom layers becomes large during the summer, preventing the two layers from mixing, and has a dissolved oxygen concentration of 3 mg/L or less." · National Institute of Fisheries Science (2025-07-25) — Expansion of occurrence areas along the southern coast: Jinhae Bay, Yeosu Gamak Bay, Tongyeong Buksin Bay, Goseong Jaran Bay, Hansan Geoje Bay, Jinju Bay. Bottom measured values ​​1.31 / 1.38 / 2.45 / 2.87 mg/L. · National Institute of Fisheries Science, "2025 Data Collection on Occurrence of Oxygen-Deficient Water Masses in Coastal Fishing Grounds" (2026-05-15) — Occurrence period: May–October. · Lee et al. (2018) Front. Mar. Sci. 5:70 — Jinhae Bay semi-enclosed inner bay (average depth ~20m), summer bottom DO low 2mg/L, stratification ΔT≈6°C. · Satellite = NASA Worldview/GIBS (Public Domain) · Contains modified Copernicus Sentinel data 2025 (HLS) · Map = South Korean coastline based on Wikimedia CC ⚠️ Honest Clarification · All the octopus experiments above were conducted using species other than the native Korean common octopus (O. sinensis). Since different species can exhibit different behaviors, the species was identified for each image. · Cerezo (2005) did not measure whether the octopus was "eating," but rather measured its breathing (water change frequency and oxygen consumption). The conclusion that "octopuses close their mouths when oxygen is scarce" was inferred from that result. · The map of the South Sea in the video is a conceptual diagram. It was drawn to demonstrate the principle that "enclosed bays are red, and open waters are blue," and the colored areas do not exactly correspond to actual sea boundaries. The data from the National Institute of Fisheries Science mentioned above serves as the basis for determining which areas experience oxygen scarcity and when. · No one has yet proven that "octopuses bite more when the current is strong." Even researchers are debating the issue. · It has not been determined why the dawn peak occurs (light? food? predators?). #OctopusFishing #OctopusFishing #StoneOctopusFishing #CommonOctopus #OctopusSpot