学生ネットワーク

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Fly fishing and weir fishing (Yana) for Ayu is a popular summer pastime in Japan and example of a Japanese traditional fishing method. The Ayu fish (a small Japanese river trout) is a unique genus. Ayu fish are amongst the Japanese people's favorite fish. The fish have a sleek body and when broiled with salt are tastier than many other species. To Japanese people, the word Ayu conjurs images of summer, the countryside, and good taste.

They have a lifespan of only 1 year and are found in the many fast flowing rivers of Japan. Unfortunately dam construction has seriously affected their habitat, although it should be noted that the impact of dams and other man-made structures on the Ayu is one of the causes of the growing environmental awareness in Japan.

Part 1. Ayu Fishing with "Yana"

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Most people who catch Ayu do so at a Yana. A Yana is a small weir of wood and stone, with a fish trap (a type of fishing net) attached made of bamboo, reeds or other suitable materials. The opening of the fishing season is good for a barbecue of freshly grilled Ayu with salt and miso (bean paste) and cold beer.

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The origins of yana are unknown, though the Ainu (Japan's indigenous people) and the Japanese have long raised these fish and harvested annual catches. This fishing technique is not restricted to Japan, and was widely practised across the Eurasian continent wherever the environment suited.

The basic method is to funnel the water of a river to pass over a small weir, usually less than a meter high. A platform (typically made from bamboo) is then built below the weir, so that the water passes through the gaps and continues downstream. Of course, if you place the poles close enough together, any fish washed over the weir will be trapped and flip around on the raft and be easy to pick up.

Part 2. Ayu Fishing with rod and reel

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It is of course possible to fish for Ayu using a rod and reel. And there are many such enthusiasts. Catching Ayu with a rod and reel though can take some patience and skill.

The Technique:

The Ayu eat organic plant matter on the pebbles or rocks on the river bed. Ayu are very territorial, and each fish tries to maintain a territory of about 10 to 20 square meters (approx 105 to 210 square feet). They will attack any other fish that enter their territory. An experienced angler takes this behavior into consideration and uses other Ayu as bait ("invaders").

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The trick is to attach 3 to 4 hooks to the underside of a bait Ayu, using the gills to secure the line. The fish is still alive and able to swim, though weakened. The angler then looks for an Ayu grazing the waterweeds. Note that Japanese streams usually aren't deep, and an Ayu will usually forage in the shallower areas or slower flowing parts of a stream away from the thalweg (the thalweg is the deepest and therefore fastest flowing part of the stream as a result of the "pool and riffle" sequence) as there will be more organic matter available to eat.

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The next step is to guide the bait (invader) fish using a very long rod into the territory of the Ayu. The Ayu will naturally regard the bait as an invader of its territory (especially if another Ayu is used as bait). Initially the Ayu will keep an eye on the bait fish to see if it will respect its territory (ie swim away once it realizes that this part of the stream is "taken"). As the invader will of course not leave the territory (because the angler will keep it in there using the rod) the Ayu will attack in an effort to drive the invader off and so protect his feeding area.

The attacks involve charging and ramming the belly of the bait fish. Since the bait fish is alive and struggling but unable to leave the territory (due to the rod), it is usually only a matter of time before the Ayu is hooked. Why??? Because the bait fish will repeatedly try to escape the attacker (and in doing so pull the hooks along beneath). The fish that has just been caught is usually hooked on the shoulder (and so not badly hurt), but to prevent further injury you shouldn't reel them in - use a net and bucket.

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Why would you do that?

After retrieving both fish from the stream, the next step is to switch the exhausted bait fish for the newly caught Ayu. This then becomes the new bait/invader fish - this is the unique aspect of Ayu fishing. The process is then repeated, each time with the newly caught fish replacing the exhausted invader.

Being Japan, and since the Ayu season is summer, the sociable thing to do next is have a barbecue. As with fish caught at a "Yana", you skewer the fish through the mouth with a sharp kebab-stick. Once grilled, salt lightly and start eating. Best accompanied by a selection of sashimi, salads and icy cold beer.

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