Dogfish is referred to as true fish, amongst Dogfish, Jellyfish, Starfish, and Silverfish. Jellyfish is not listed as a fish as it does not meet the characteristics of being a fish. Recall that, A fish should have gills, fins and a vertebra which is all lacking in a jellyfish.
What’s a true fish?
A true fish belongs to the phylum Chordata and vertebrata, so they have a backbone. They have had notochord during the embryonic development which is now replaced by the backbone. They belong to class pisces and have a single chambered heart. They breathe through gills and have fins for propulsion.
Which fish is not true fish?
Jellyfish, star fish and cuttle fish do not fulfil all the criteria and that is why they are not true fishes.
Which one is a true fish Class 9?
Dogfish is a true fish, amongst Jellyfish, Starfish, Dogfish and Silverfish.
Which of the following is an example of a true fish?
Flying fish is an example of a true fish.
Silverfish is a wingless insect that falls under the phylum- Arthropoda. Cuttlefish is a marine animal which falls under the phylum- Mollusca. Jellyfish are also marine animals that come under the phylum- Cnidaria.
Is Sea Cow a true fish?
Sea cow. Sea horse is the true fish. … Hence, option (c) is correct.
Is hag fish a true fish?
Hagfishes are primitive, jawless fish. hagfish, also called slime eel, any of about 70 species of marine vertebrates placed with the lampreys in the superclass Agnatha. … Depending on the species, they grow to about 40 to 100 cm (16 to 40 inches) long.
Is Whale a true fish?
Whale is a mammal while the Cuttlefish is a mollusc and the Silver fish is an arthropod. So, flying fish is the true fish as it comes under the family of Exocoetidae.
Is Angel fish a true fish?
Pterophyllum is a small genus of freshwater fish from the family Cichlidae known to most aquarists as angelfish. … Angelfish are ambush predators and prey on small fish and macroinvertebrates. All Pterophyllum species form monogamous pairs.
Is Sea Horse a true fish?
Seahorses are fish. They live in water, breath through gills and have a swim bladder. However they do not have caudal fins and have a long snake-like tail. They also have a neck and a snout that points down.
Is puffer fish a true fish?
Tetraodontidae is a family of primarily marine and estuarine fish of the order Tetraodontiformes. The family includes many familiar species variously called pufferfish, puffers, balloonfish, blowfish, blowies, bubblefish, globefish, swellfish, toadfish, toadies, honey toads, sugar toads, and sea squab.
Is salmon a true fish?
Salmon (/ˈsæmən/) is the common name for several species of ray-finned fish in the family Salmonidae. Other fish in the same family include trout, char, grayling, and whitefish. Salmon are native to tributaries of the North Atlantic (genus Salmo) and Pacific Ocean (genus Oncorhynchus).
Is hippocampus a true fish?
A seahorse is a type of fish closely related to pipefishes and belonging to the scientific family Syngnathidae. … The seahorse’s scientific genus name, Hippocampus, is Greek for “bent horse.” The seahorse may appear as if it wears armor; its body is covered with bony rings and ridges.