One study, using relevant life history data from the Japanese medaka ("Oryzias latipes") predicts that a transgene introduced into a natural population by a small number of transgenic fish will spread as a result of enhanced mating advantage, but the reduced viability of offspring will cause eventual local extinction of both populations. GM coho salmon show greater risk-taking behaviour and better use of limited food than wild-type fish. Transgenic coho salmon have enhanced feeding capacity and growth, which can result in a considerably larger body size (>7-fold) compared to non-transgenic salmon. When transgenic and non-transgenic salmon in the same enclosure compete for different levels of food, transgenic individuals consistently outgrow non-transgenic individuals. When food abundance is low, dominant individuals emerge, invariably transgenic, that show strong agonistic and cannibalistic behavior to cohorts and dominate the acquisition of limited food resources. When food availability is low, all groups containing transgenic salmon experience population crashes or complete extinctions, whereas groups containing only non-transgenic salmon have good (72%) survival rates. This has led to the suggestion that these GM fish will survive better than the wild-type when conditions are very poor. Successful artificial transgenic hybridization between two species of loach (genus "Misgurnus") has been reported, yet these species are not known to hybridize naturally. GloFish were not considered as an environmental threat because they were less fit than normal zebrafish which are unable to establish themselves in the wild in the US. The FDA has said the AquAdvantage Salmon can be safely contained in land-based tanks with little risk of escape into the wild, however, Joe Perry, former chair of the GM panel of the European Food Safety Authority, has been quoted as saying “There remain legitimate ecological concerns over the possible consequences if these GM salmon escape to the wild and reproduce, despite FDA assurances over containment and sterility, neither of which can be guaranteed”. AquaBounty indicates their GM salmon can not interbreed with wild fish because they are triploid which makes them sterile. The possibility of fertile triploids is one of the major short-falls of triploidy being used as a means of bio-containment for transgenic fish. However, it is estimated that 1.1% of eggs remain diploid, and therefore capable of breeding, despite the triploidy process. Others have claimed the sterility process has a failure rate of 5%.