Goldfish in the context of "Prussian carp"

Ethanol fermentation, also called alcoholic fermentation, is a biological process which converts sugars such as glucose, fructose, and sucrose into cellular energy, producing ethanol and carbon dioxide as by-products. Because yeasts perform this conversion in the absence of oxygen, alcoholic fermentation is considered an anaerobic process. It also takes place in some species of fish (including goldfish and carp) where (along with lactic acid fermentation) it provides energy when oxygen is scarce.

Ethanol fermentation is the basis for alcoholic beverages, ethanol fuel and bread dough rising.

Taiyaki (鯛焼き, lit. 'baked sea bream') is a Japanese fish-shaped cake, commonly sold as street food. It imitates the shape of tai (鯛, red sea bream), which it is named after. The most common filling is anko. Some shops even sell taiyaki with okonomiyaki, gyoza filling, or a sausage inside. Smaller, differently shaped versions called kingyoyaki (金魚焼き, lit. 'baked goldfish') are also available and often sold in bags of five, ten, or more.

Taiyaki is similar to imagawayaki, which is a thick round cake, also filled with sweet adzuki bean paste or custard.

The lateral line, also called the lateral line organ, is a system of sensory organs found in fish, used to detect movement, vibration, and pressure gradients in the surrounding water. The sensory ability is achieved via modified epithelial cells, known as hair cells, which respond to displacement caused by motion and transduce these signals into electrical impulses via excitatory synapses. Lateral lines play an important role in schooling behavior, predation, and orientation.

Early in the evolution of fish, some of the sensory organs of the lateral line were modified to function as the electroreceptors called ampullae of Lorenzini. The lateral line system is ancient and basal to the vertebrate clade, as it is found in fishes that diverged over 400 million years ago.