As we know that 70% of the Earth's surface is covered with water. Therefore, species which living in the water are very diverse in nature as compare to any other species. Fish is one of the species whose number is greater than the total of all other vertebrate species, including amphibians, reptiles, birds, and mammals.
Fish is a cold-blooded aquatic vertebrates usually having scales and breathing through gills. This specie is used for the study of the flexible behaviour of the vertebrates. For example- Zebra fish are used in the studies of gene expression.
According to the Ichthyology (branch of zoology that studies fishes), modern fishes are divided into three classes: 1. Agnatha (the jawless fishes); 2. Chondrichthyes (jawed fishes that possess skeletons made of cartilage; and sharks, rays, skates and ratfishes); 3. Osteichthyes (jawed fishes that have skeletons made of bone).
Characteristics of the fish species
An animal can only classified as fish if they possess the following characteristics which are given below:
1. They must have gills for breathing.
2. They must have scales as skin.
3. They must use fins for movement.
4. They must be water habitat.
5. They must be cold-blooded.
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10 Longest Fish Species in the World
All the longest animals on earth are found in the oceans and many of them are belongs to the fish species. The name of top 10 longest fish species in the world are given below along with their scientific names and length:
10. Great white shark
Scientific name: Carcharodon carcharias
Length: 4.5 m– 6.4 m (Female adult), 3.5 – 4 m (Male adult)
9. Pacific Sleeper Shark
Scientific name: Somniosus pacificus
Length: 3.4 m to 4.0 m (Male adult), 4.6 to 4.9 m (Female adult)
8. Beluga sturgeon
Scientific name: Huso huso
Length: 5-7.2 m (Female beluga is typically 20% larger than the male.)
7. Greenland shark
Scientific name: Somniosus microcephalus
Length: 4.8 m - 6.4 m
6. Longcomb sawfish
Scientific name: Pristis zijsron
Length: 6 m-7.3 m
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5. Tiger Shark
Scientific name: Galeocerdo cuvier
Length: 3.25 m–4.25 m
4. Largetooth sawfish
Scientific name: Pristis pristis
Length: 2–2.5 m to 7.5 m
3. Giant oarfish
Scientific name: Regalecus glesne
Length: 3 m- 11m
2. Basking shark
Scientific name: Cetorhinus maximus
Length: 6 to 12.27 m
1. Whale shark
Scientific name: Rhincodon typus
Length: 9.8 m to 18.8 m
Above top 10 list of the longest fish species are filtered from all the fish species on the basis of size range. The size range of the fish species is between 8 millimetres to 18.8 meters.
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Top 10 Longest Fish Species in the World
| Longest Fish Species | Description |
| 1. Whale shark | Scientific name: Rhincodon typus Length: 9.8 m to 18.8 m |
| 2. Basking shark | Scientific name: Cetorhinus maximus Length: 6 to 12.27 m |
| 3. Giant oarfish | Scientific name: Regalecus glesne Length: 3 m- 11m |
| 4. Largetooth sawfish | Scientific name: Pristis pristis Length: 2–2.5 m to 7.5 m |
| 5. Tiger Shark | Scientific name: Galeocerdo cuvier Length: 3.25 m–4.25 m |
| 6. Longcomb sawfish | Scientific name: Pristis zijsron Length: 6 m-7.3 m |
| 7. Greenland shark | Scientific name: Somniosus microcephalus Length: 4.8 m - 6.4 m |
| 8. Beluga sturgeon | Scientific name: Huso huso Length: 5-7.2 m (Female beluga is typically 20% larger than the male.) |
| 9. Pacific Sleeper Shark | Scientific name: Somniosus pacificus Length: 3.4 m to 4.0 m (Male adult), 4.6 to 4.9 m (Female adult) |
| 10. Great white shark | Scientific name: Carcharodon carcharias Length: 4.5 m– 6.4 m (Female adult), 3.5 – 4 m (Male adult) |
All aspects of the fish species are closely correlated with adaptation to the total environment, physical, chemical, and biological.
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