Fish are the gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds and mammals which all descended from within the same ancestry). Because in this manner the term “fish” is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology. The traditional term pisces (also ichthyes) is considered a typological, but not a phylogenetic classification.
The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods.
Most fish are ectothermic (“cold-blooded”), allowing their body temperatures to vary as ambient temperatures change, though some of the large active swimmers like white shark and tuna can hold a higher core temperature.
Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams (e.g., char and gudgeon) to the abyssal and even hadal depths of the deepest oceans (e.g., gulpers and anglerfish). With 33,600 described species, fish exhibit greater species diversity than any other group of vertebrates.
Fish are an important resource for humans worldwide, especially as food. Commercial and subsistence fishers hunt fish in wild fisheries (see fishing) or farm them in ponds or in cages in the ocean (see aquaculture). They are also caught by recreational fishers, kept as pets, raised by fishkeepers, and exhibited in public aquaria. Fish have had a role in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.
Fish Fry Easy Recipes
Coconut Oil- 2 Tablespoons
Seerfish(Kingfish) – 250 Gms
Turmeric Powder-1 Teaspoon
Ginger Garlic Paste-2 Teaspoons
Lemon Juice-2 Teaspoons
For the Masala
Cumin Seeds-1 Teaspoon
Coriander Seeds-1 Teaspoon
Pepper Corn-1 Teaspoon
Fennel Seeds-1/2 Teaspoon
Mustard Seeds-1/2 Teaspoon
Dry Red Chillies-4
Salt -according to Taste
Clean the Fish and Take the Slices.
Mix Lemon Juice,turmeric Powder,ginger Garlic Paste .
Marinate the Fish With This Paste and Keep for 30 Minutes.
Dry Roast the Masala Ingredients and Make a Coarse Powder.
Add Required Salt to the Masala Powder and Mix Well.
Apply the Masala Paste on the Fish Pieces on Both Sides.
Heat a Tawa, Add Coconut oil.
Shallow Fry the Fish Pieces in Medium Flame, for 3 Minutes.
After 3 Minutes Flip the Other Side and Shallow Fry for 3 Minutes.
Serve It Hot.