[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"learn-glossary-surface-film":3},{"id":4,"title":5,"aliases":6,"body":11,"category":33,"definitionShort":34,"description":17,"disciplineTags":35,"extension":37,"meta":38,"navigation":39,"path":40,"relatedCards":41,"relatedTerms":44,"seo":50,"sourceRef":51,"stem":52,"term":5,"__hash__":53},"learn_glossary\u002Flearn\u002Fglossary\u002Fsurface-film.md","Surface Film",[7,8,9,10],"meniscus","film","surface tension","in the film",{"type":12,"value":13,"toc":29},"minimark",[14,18,21],[15,16,17],"p",{},"Surface film is the membrane that holds the river's surface together. Drop a leaf and you'll see it deflect before breaking through; that same tension is what an emerging insect has to push through to fly.",[15,19,20],{},"For trout, the film is the dinner table's most efficient feeding zone. Bugs are stuck — they can't sink, can't fly, and the fish doesn't have to expend energy chasing them. Riseforms that don't break the surface (just a soft dimple or a head-and-tail roll) are almost always fish eating in or just under the film.",[15,22,23,24,28],{},"To fish the film, trade your floating dry fly for an emerger pattern: a CDC emerger, a sparkle dun, or a soft-hackle wet. Pattern goal is ",[25,26,27],"strong",{},"half-on, half-through"," — body hanging below, wing case in the film. Use floatant only on the wing case so the body sinks. Watch the swirl, not the fly.",{"title":30,"searchDepth":31,"depth":31,"links":32},"",2,[],"technique","The thin layer of water at the air-water interface, held together by surface tension. Mayfly and caddis emergers struggle through this barrier to reach the air — and trout key on the vulnerable seconds when bugs are stuck halfway through.",[36],"fly","md",{},true,"\u002Flearn\u002Fglossary\u002Fsurface-film",[42,43],"reading-the-surface-film","reading-rises",[45,46,47,48,49],"emerger","dry-fly","dun","cdc-emerger","trailing-shuck",{"description":17},null,"learn\u002Fglossary\u002Fsurface-film","_KFsDLk_1Q7-3qXgIEEYoTiRtIrbTKTBraJnc3yujyI"]