Ka taƙaita labarin:  Wani kifin tuna yana yawo a cikin wani tanki da a dā yake da kyau a wani gidan kifi a Japan bayan da fiye da abokan kifinsa 150 suka mutu ba zato ba tsammani. Ma'aikata a Tokyo Sea Life Park suna ta da kawunansu bayan mutuwar kwanan nan a ranar Talata, suna barin tuna ɗaya kaɗai a cikin babban tanki mai siffar donut. Masu bincike suna kokarin gano dalilin mutuwarsu, kuma wani zaɓi da ake bincikawa shi ne guba. Ba a bayyana ba: Ana binciken dalilin mutuwar fiye da kifi 150, amma a halin yanzu ba a sani ba. Kifi mai zaman kansa: Sai kawai tuna daya kadai ya kasance a cikin babban tanki mai siffar donut a Tokyo Sea Life Park a Japan. Wani mai magana da yawun wurin yawon shakatawa ya ce: 'Mun yi amfani da tankin tuna tun lokacin da aka buɗe wurin kifin a shekara ta 1989 amma ba mu taɓa ganin irin wannan mutuwar ba. 'Muna nazarin abin da ya haifar da mutuwar kifi, amma ba mu gano shi ba tukuna. Muna zargin cewa zai iya zama saboda sababbin abubuwan da ba su kasance ba a baya. " Ana la'akari da hasken tanki da sauran abubuwan da zasu iya haifar da damuwa tsakanin kifin, ko kuma kasancewar wani abu mai guba a cikin ruwa. Tankin mai nauyin tan 2,200 ya taɓa ɗauke da kifin tuna 69, kifin tuna 52 na gabas da kuma kifin bonito 38. A watan Disamba, yawan mutanen tankin ya fara raguwa ba zato ba tsammani tare da kifaye 30 kawai da ke raye a tsakiyar watan Janairu. Masu bincike suna kokarin gano dalilin mutuwarsu, kuma wani zaɓi da ake bincika shi ne guba. 'Na biyun da ya gabata wanda ya mutu a bayyane ya yi karo da bangon acrylic sau biyu,' in ji kakakin. 'Ya sha wahala a karya kashin baya, wanda shi ne m amma ba sosai m ga tuna kiyaye a cikin wani tanki. 'Binciken da aka yi a baya ya gano wasu nau'in ƙwayoyin cuta a cikin wasu daga cikin kifin da suka mutu, amma ba irin wanda yawanci ke da lahani a gonakin kifi ba.'
Fiye da kifi 150 sun mutu a wani akwatin kifaye na Japan kuma daya ne kawai ya tsira. Har yanzu ma'aikatan da ke aiki a Tokyo Sea Life Park ba su san abin da ya yi sanadin mutuwarsu ba. Ana binciken guba da kuma abubuwan da zasu iya haifar da damuwa da kifi. Tankin yana dauke da bluefin 69 da kuma 52 na gabashin kananan tuna, da kuma 38 na gabashin bonito.