WHAT ARE Characteristics  of small worms called jiggers?
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http://www.artoftravel.com/09health.htm\n\nExplanation of what they are about halfway down the page, ahead of "chiggers" and "bedbugs".  Apparently, they're fleas?
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There is no one best color in every situation. In general people fish lighter colors like watermelon or smoke in clear water and darker colors like purple and brown in dark or murky water. Metallic flake is also important in the bait. \n\nAs for the weight, try to use the smallest one you can and still get a good cast. You get better action this way. Also use wide gap hooks specifically designed for a worm.\n\nFish worms on structure, in cover, and on drop offs. Fish will be relating to this features.
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Small minnows.\n\nCoach
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It's impossible to identify the worm from that description.  There are a number of options.\n\nHowever, my best guess is that it is a horsehair worm.  Horsehair worms are rather fascinating creatures, possibly responsible for inspiring the film "Alien".  Adult worms live in water where they lay their eggs.  The eggs hatch into larvae, who make their way to an appropriate place to be eaten!  Once an insect (usually a grasshopper or a relative, such as cockroaches) eats them, they crawl out of it's digestive system and live in it's abdomen, growing every larger.  When they become adults, they secrete a chemical, causing the insect to get very thirsty.  It rushes to the nearest body of water, where the horsehair worm tears it's way out of the insects stomach and into the water, where it looks for another horsehair worm so it can start the whole process over again.
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Sounds like a water strider:\nhttp://www.cirrusimage.com/bugs_water_strider.htm\nThese guys are very common in freshwater everywhere - even in salt water in mid-ocean. They might nip you if mishandled. \n\nIt might also be a whirligig beetle or another one of the aquatic beetles:\nhttp://academic.emporia.edu/aberjame/wetland/wildlife/wild1.htm
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Here's a big picture of an Asilidae:\n\nhttp://www.insects.org/entophiles/diptera/dipt_en004.html\n\n\nAnd here's a bunch of info from "Featured Creatures":\n\nhttp://creatures.ifas.ufl.edu/beneficial/flies/robber_flies.htm
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Of adult animals that have a spine (i.e. the vertebrates), the smallest one, with the shortest spine would probably be a male Stout Infantfish (Schindleria brevipinguis) which can be only 6.5 mm long (head to tail) when sexually mature.  The spine of the infantfish would be a bit shorter than that, taking into account the size of its head and tail.\n\nWhether or not you count larval fish (which can be microscopic) depends on whether or not you consider them to have a complete spine.
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Maggots, worms are good as the trout is very predatory. Also they will take bread flake, infact they love it. Its cheap and can be used with ease. A top bait, and it works at night, they can really smell it. For me, it would be bread then maggots then worms TIGHT LINES
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Chaetognathas which are known as arrow worms.  They are torpedo-shaped, translucent, planktonic marine invertebrate organisms.
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This is a long story so hold on and bear with me OK?\nThe lancet fluke (Dicrocoelium lanceolatum) belongs to the order Trematoda. Like other flukes, scientifically called trematodes, it as well shows a generation cycle with a change of reproduction as well as a change of hosts. The terminal host are mammals, usually sheep or goats. The distribute the fluke's eggs by their excrements on plants, on which snails feed. Those snails again are the intermediate host. . \nThose snails, mostly hygromiid snails of the species Helicella or enid snails (Zebrina), take in the flukes eggs together with their food. In the snail's digestive gland the fluke' first larval generation hatches. That generation is called miracidium. A miracidium is a simply built larva with few resemblance to the adult fluke. It is able to swim or at least to float by a ciliar crest. The miracidium makes a metamorphosis inside the snail, resulting in the next larval stage, that more resembles the adult fluke. The so called cercary has got a tail that propels it in the water. The cercaries change themselves in endurance stages called cystes, that the snails surrounds with a mucus layer and excretes them.\nRed ant (Formica rufa). Source: Manfred Eidelloth.   \nAnts eat those mucus balls (obviously the mucus contains also certain pheromones that makes it highly attractive to ants) and then are afflicted by the cercaries. The cercaries grow in the ants' abdomen (terminal body part) and then one of them moves into the head. There they afflict the ant's nervous system and cause a change of behaviour, that makes Bernard Werber *) call them "zombie ants". The ants now, very untypically, climb up plant stems and attach themselves with their mandibles to exposed positions such as leaves. Grazing mammals, such as sheep or goats, eat the plants together with the ants and then infect themselves with the lesser liver fluke. Inside this terminal host the cercaries change into the fluke's adult stage which reproduces sexually and then lays eggs that are excreted by the mammal -  the generation cycle is closed when the next snail eats the eggs.
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Chathuringmes (or worms!)
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I call them "wooly worms" I'm not sure if that's their given name or not. I guess they'd just be caterpillars or something. The brown and black, furry guys. Me and my dad used to ride our bikes and search for them.
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Smallest Insect: \n\n\n\nFairyflies are tiny wasps (family Mymaridae) that are probably the smallest of all insects.   In Dicopomorpha echmepterygis, a Costa Rican species that parasitizes the eggs of other insects, the males may be no more than 0.139 mm in length.   Their tiny bodies, neatly packaged with complete digestive, reproductive, respiratory, and circulatory systems are actually smaller than a single-celled paramecium
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A downrigger is a method of placing an fishing lure down th the desired depth. A downrigger is a cannonball (large weight) held to the surface by stainless steel cable. A clip attaches a fishing line to this wire. Then a downrigger release is hooked to the downrigger wire and then the bait is attached to the release. The release is basically another fishing line that holds the bait and the wire together.
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They hatch from eggs. At first they are little larvae (squiggly white wormy things), then they pupate, metamorphose, and emerge as flies.
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The earthworm has a body cavity through which the intestine passes with a front part that is modified to form special structures. The muscular throat sucks food into the food storage organ and it has a gizzard (a muscular organ in which food is ground into smaller pieces) that will grind food. They have an intestine (a region where chemical digestion and absorption occur). The intestine is tube-shaped and runs the entire length of the worm. It has a very tiny brain that is connected to a nerve cord that lies under the intestine. This comprises the nervous system of the earthworm.
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worms that infest humans are transmitted through contact with feces