Baryancistrus xanthellus (L018, L081, L085, L177, LDA060) er en art av harniskmaller i gruppen Ancistrini. Det er en bunnlevende ferskvannsfisk som finnes i Rio Xingu i Amazonas-vassdraget. Den blir opptil 29,7 cm lang SL[1]. Baryancistrus xanthellus er på grunn av sitt spesielle utseende en populær akvariefisk, og har fram til arten ble beskrevet  i 2011 gått under forskjellige L-numre, samt det engelske populærnavnet «gold nugget» eller «golden nugget» i akvariehandelen.

Odontodes, or dermal teeth, are hard structures found on the external surfaces of animals or near internal openings. They consist of a soft pulp cavity surrounded by dentine and covered by a mineralised substance such as enamel, a structure similar to that of teeth.[1] They generally do not have the same function as teeth, and are not replaced the same way teeth are in most fish.[2] In some animals (notably catfish), the presence or size of odontodes can be used in determining the sex.[3]

Hypostomus asperatus[1] is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Tocantins River basin. The species reaches 22.9 cm (9 inches) in standard length and is believed to be a facultative air-breather.[2]

English: Panaque armbrusteri, Brazil, Altamira, Para

Hypostomus subcarinatus is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the coastal drainage basins of eastern Brazil, including the São Francisco River basin. The species reaches 31 cm (12.2 inches) in total length  and is believed to be a facultative air-breather.[1] Although originally described in 1855, no verifiable scientific record of the species was made until a 2014 survey of an urban lake in downtown Belo Horizonte in the state of Minas Gerais collected seven specimens that were later recognized as Hypostomus subcarinatus, leading to a redescription of the species in 2019.[2]

A zebra loach (Botia striata), size about 7cm.

Hypostomus commersoni[1] is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Paraná River drainage, including the Iguazu River, the Paraguay River, the Río de la Plata, and the Dulce River. It is typically found in rivers with muddy substrates and moderate currents. The water that H. commersoni inhabits usually has a temperature of 16.8 to 27.8 °C (62.2 to 82.0 °F), a pH of 7.2 to 9.2, a turbidity of 23.7 to 442 NTU, an oxygen concentration of 6.1 to 9.1 mg/L, and a conductivity of 1.087 to 2.654 μS/cm.[2]

English: Swimming zebra shark in Aqua park shinagawa

The zebra bullhead shark (Heterodontus zebra) is a bullhead shark of the family  Heterodontidae found in the central Indo-Pacific between latitudes 40°N and 20°S, from Japan and Korea to Australia.[1][2] It is typically found at relatively shallow depths down to 50 m (160 ft), but off Western Australia, it occurs between 150 and 200 m (490 and 660 ft).[1] It can reach a length of 1.25 m (4.1 ft).[2] The reproduction of this bullhead shark is oviparous.[2]

English: Zebra shark (Stegostoma fasciatum) baby is born at The National SEA LIFE Centre and filmed for an exclusive documentary with the BBC.