Ranchu tail. The caudal peduncle itself should be broad and neither lengthy or too short (a properly formed caudal peduncle avoids swimming motion impairments to this type of goldfish). The ranchu's tail meets the caudal peduncle at a forty-five degree angle, giving the fish a unique swimming motion. Furthermore, the tail lobes are rounded, and all other finnage are paired. The most prominent feature of the ranchu is its head. There must be sufficient space between the eyes, and also from the eyes to the front of the head. The gill cover should figuratively extend quite far towards the tail. The
Pomadasys stridens Pomadasys stridens Pomadasys stridens, the striped piggy or lined piggy, is a grunt from the western Indian Ocean, it is one of a group of Indo-Pacific marine species which have colonised the Mediterranean Sea through the Suez Canal from the Red Sea, a process known as Lessepsian migration. "Pomadasys stridens" has a silvery body which is slightly darker dorsally than it is ventrally, it has 3-4 golden-brown stripes along its body, merging towards the caudal peduncle, and a dark blotch on the operculum. It has a relatively large head with a small, slightly oblique mouth and two pores on the