Diodon hystrix
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Alien:
Casual
"Based on our genetic results, it is difficult to determine if the Cyprus sample is an aquarium release or a Lessepsian immigrant, because this species is found worldwide and shows little genetic differentiation at the COI marker level. It is plausible that a careless aquarium hobbyist released the fish after it outgrew the aquarium, as it is a relativaley common practice (Semmens, Buhle, Salomon, & Pattengill-Semmens, 2004). Further work, sampling and observations are therefore necessary to conclusively elucidate the introduction pathway" (Kleitu et al. 2020).
Kleitou P, Giovos I, Antoniou C, Ioannou G, Bernardi G (2020)The third record of black-spotted porcupinefish Diodon hystrix Linnaeus, 1758 in the Mediterranean Sea. Journal of Applied Ichthyology 36(2): 227-230. https://doi.org/10.1111/jai.13999