DSC_3984 Koi carp (Cyprinus carpio) offered for sale in a city fish market. Koi are an ornamental strain of the common carp native to Asia and Europe. One of the most invasive fish species worldwide, koi make water turbid and change the habitat for native fish. For a period of time each year, coinciding with Polynesian and Chinese festivals, they are now offered for sale as a food fish in Auckland, where demand is slowly increasing. Auckland *
DSC_3986 Koi carp (Cyprinus carpio) offered for sale in a city fish market. Koi are an ornamental strain of the common carp native to Asia and Europe. One of the most invasive fish species worldwide, koi make water turbid and change the habitat for native fish. For a period of time each year, coinciding with Polynesian and Chinese festivals, they are now offered for sale as a food fish in Auckland, where demand is slowly increasing. Auckland *
11004-09201 Tench (Tinca tinca) juvenile. The first tench were introduced around Auckland in 1867, then in the 1950's they were also released near Otaki and Oamaru. They have since been spread illicitly to Northland, Whanganui, Nelson, Canterbury and Otago. They live in slow-moving or still waters and are classified as ‘sports fish’ with anglers requiring a licence to legally fish for them. They are regarded as a pest fish for reducing water clarity in shallow lakes where they alter food webs and disturb sediments. Island Stream *
