瓶の中で１匹ずつ養殖、気性の荒いシャムトウギョ　ベトナム

【ハノイＡＦＰ＝時事】ベトナムの首都ハノイにある養魚場に置かれたガラスやプラスチックのボトル数千本。それぞれの瓶に１匹ずつ入っているのは気性が荒く、色鮮やかな魚「シャムトウギョ（闘魚）」だ。（写真はベトナム・ハノイの養魚場でシャムトウギョを見せるチャン・ゴック・タンさん）
　「ベタ」としても知られるこの魚を養殖して２０年以上になるチャン・ゴック・タンさんの商売は、スイスイと順調に進んでいる。
　シャムトウギョは、かつてはその闘争的な性質を利用した賭けの対象として互いに戦わされていたが、今日ではほとんどが観賞用だ。養魚場では衝突しないよう、１匹ずつ別の容器に入れて飼われている。
　「闘魚の性格を研究した結果、使用済みのプラスチックボトルが養殖に適していることが分かった」とタンさん。使用済みボトルは地元の鉄道駅で集めている。このやり方で「飼育がずっと簡単になり、魚同士の戦いを防ぐことができる」。
　タンさんは年間約３０００～４０００匹の闘魚を養殖し、１匹当たり５０セント～５ドル（約５４～５４０円）で販売している。【翻訳編集ＡＦＰＢＢＮｅｗｓ】
〔ＡＦＰ＝時事〕（2021/04/20-13:29）

Thousands of glass and plastic bottles lie across the floor of Tran Ngoc Thang's farm in Hanoi, each one home to an aggressive, brightly coloured fish that must be raised alone.
Thang has been breeding Siamese fighting fish, also known as betta fish, for more than 20 years in Vietnam -- and his business is going swimmingly.
They were once prized for their combative nature and were pitted against each other in fights, with bets placed on which fish would triumph.
Now they are mostly kept for ornamental purposes but are still kept apart on Thang's fish farm to avoid any clashes.
I have studied the character of these fighting fish, and I know used plastic bottles are a good place to raise them, he told AFP, explaining that he collects bottles from the local train station.
I cut the bottle neck, and drill a hole, which makes it easier when I want to change the water, the 54-year-old said, adding that the fish are fed everyday from a nearby pond.
This way, caring for them is much easier and we can avoid them fighting each other.
On top of other fish species, Thang raises around 3,000-4,000 betta fish a year, and sells them for between 50 cents and $5 each.
One of his clients, 35-year-old Bui Doan Tung, has been devotedly buying all kinds of Siamese fighting fish -- halfmoon, dumbo, fancy and koi -- for the last four years.
They are not for fighting now, just for admiring, he says. Each type is beautiful in a different way.