Lungfish: The Oldest Living Animal On Earth

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The lungfish is the oldest living animal on earth. It lives in muddy waters in Africa, South America, and Australia. What seems most surprising about these creatures is that they can survive without breathing air. They have developed the ability to respire through their skin, mouth, and gills. These fish can live without oxygen for … Read more

Phylogeny of Fishes

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The number of living fish species is over 26,400 which is 51.9% of almost all vertebrates. Like other vertebrates, fish have an unequal abundance and diversity. Their ancestors were widespread 500 million years ago. They spread through a massive time-wide evolution and had the opportunity to originate and become extinct in major phyletic streams, even … Read more

Chondrichthyes: Characteristics, Classification and Examples

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The word ‘chondrichthyes’ came from Greek word ‘chondr’ meaning cartilage and ‘ichthys’ meaning fish. Chondrichthyes include all the cartilaginous fishes that contain cartilaginous skeletons. All the representatives of this group have jaws and paired fins with paired nares. The body is covered with placoid scales. Their body growth range from 10 cm (finless sleeper ray) … Read more

Cephalaspidomorphi : Characteristics and Examples

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Fish is a cold-blooded aquatic vertebrate organism which makes the most diverse and largest taxonomic group. It contains the following four taxonomic classes: Myxini Cephalaspidomorphi Elasmobranchiomorphi, and Osteichthyes. Cephalaspidomorphi (Hagfishes and Lampreys) The class Cephalaspidomorphi is named after the Greek word kephale = head + aspidos = blade or shield + morphe = form. This … Read more

Fisheries: Bangladesh Perspective

The term “fisheries” is widely used. Fisheries generally refer to the cultivation and breeding of edible and marketable fish. However, in the broadest sense, it also includes the exploitation of many other aquatic animals besides fish. The prudent exploitation of fish, shrimps, crabs, and various types of mollusks such as oysters, dolphins, and whales for … Read more

Ecological Classification of Fishes

Ecological classification of fishes

According to E.O. Wilson, there are 1.7 million species in the world. At present, this number is considered a small part of the world’s biodiversity. There are 751,000 species of insects known worldwide, including 112,000 species of Lepidoptera, 103,000 species of Hymenoptera, and 290,000 species of Coleoptera. There are also 290,000 beetle species. On the … Read more