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Fish are gill-bearing aquatic craniate animals that require limbs among digits. They form a sister group to the tunicates, together forming the olfactories. Incorporated in this definition are the existence hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods appeared within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are distributed paraphyletic by prohibiting the tetrapods. Because in this use the term "fish" is defined negatively as a paraphyletic group, it is not acknowledged a formal taxonomic grouping in systematic biology, except it is used in the cladistic sense, including tetrapods. The traditional term Pisces is supposed a typological, but not a phylogenetic analysis.

The earliest people that can be categorized as fish were soft-bodied chordates that first emerged during the Cambrian period. Although they required a true spine, they occupied notochords which empowered them to be extra agile than their spineless counterparts. Fish would continue to emerge through the Paleozoic era, broadening into a extensive variety of forms. Several fish of the Paleozoic manifested external armor that defended them from predators. The first fish among jaws emerged in the Silurian period, after which numerous became formidable marine predators preferably than just the prey of arthropods.

Most fish are ectothermic ("cold-blooded"), enabling their body temperatures to diversify as ambient temperatures change, though remarkable of the large active swimmers like white shark and tuna can endure a higher core temperature.

Fish can communicate in their underwater environments within the method of acoustic communication. Acoustic communication in fish requires the transmission of acoustic omens from one individual of a species to another. The production of sounds as a medium of communication among fish is prevalent often used in the circumstances of feeding, aggression, or courtship behavior. The sounds transmitted by fish can vary depending on the species and stimulus involved. They can deliver either stridulatory sounds by moving segments of the skeletal system, or can generate non-stridulatory sounds by manipulating specific organs such as the swimbladder.

Fish are teeming in the largest bodies of water. They can be located in nearly all aquatic environments, from high mountain streams to the abyssal and even hadal acumens of the deepest oceans, although no species has still been documented in the deepest 25% of the ocean. Among 34,300 described species, fish manifest greater species diversity than any different group of vertebrates.

Fish are an essential resource for humans extensive, particularly as food. Commercial and subsistence fishers kill fish in wild fisheries or farm them in ponds or in enclosures in the ocean. They are further caught by recreational fishers, retained as pets, fostered by fishkeepers, and manifested in public aquaria. Fish have had a purpose in culture through the ages, serving as deities, religious symbols, and as the subjects of art, books and movies.

Fish feed Materials that are provided as food to furnish nourishment to the fish below the culture system. In an exhaustive or even semi-intensive culture system, higher stocking occurrences of the fish community are maintained. Natural food being wanting to encourage higher densities of population, it grows imperative to supply substitute feed for optimum growth and repression of nutritional diseases. One of the most fundamental and major operational inputs in prosperous aquaculture of finfish and shellfish is the fish feed. 

Up to 60% of the operational outgo may be needed as feed expenses in these culture systems. Therefore, respecting the specific nutritional necessities of the distinct cultivated species, the artificial feeds require to be formulated and prepared by reliably applying proper processing techniques. A nutrient-balanced diet is better ingested, and is digested and metabolized further efficiently for biomass production whereas, a poor quality silage may cause a problem for swelling and water property viz, building up of toxic ammonia, nitrite, hydrogen sulfide, etc performing in fish and prawn/shrimp susceptible to diseases.

There breathes a small number of quality fish feed farms in Bangladesh that produce essentially pellet diets for various sized farm fish/shrimp. The foremost reason behind this is the inadequacy of quality fishmeal that composes a major component of the feed. Consequently, the farm authority has to import great quality fishmeal from elsewhere for producing the feed. However, several huge fish feed farms in Bangladesh provide quality fish feed, shrimp feed, special shrimp feed, and feed especially for farming catfish- Pangasius, Clarius, etc. Amongst the farms the Saudi-Bangla Fish Feed Ltd, Bhaluka, Mymensingh; Pragati Fish Feed Ltd, Khulna; Niribili Feed, Chittagong, etc are important.

Now you can buy fish online. Ajkerdeal is the largest online store in Bangladesh. Here you can find various kind of fishes you can buy it online. Ajkerdeal provide fresh fishes for the customers. You can buy them online without any doubt.

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