The process of changing over time that occurs in a new ecosystem that starts with bare rock (like a new island formed in the sea
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Fish is the Super Class Pisces of Phylum Chordata. Pisces is the latin word for the fish.
CHORDATA: This phylum has the major animals with much economic importance. All the animal in this phylum has three common character that are
- Notochord: Flexible cartilaginous skeletal rod.
- Hollow, dorsal, tubular nerve cord: Differentiated into Brain and Spinal Cord
- Pharyngeal Gill Slits: In embryo stage, Pharynx become perforated and help in respiration.
CRANIATA: This group has brain protected in Skeletal brain box called cranium.
GNATHOSTOMES: This is largest group of Vertebrates. They have mouth with Jaws present.
<h2>_____________________________________</h2><h2>This is the largest group of chordates which includes 25000 species of fishes. Study of fishes is called Ichthyology.
Fish is an aquatic gill breathing gnathostomates whose stramlined body is provided with paired fins and covered over dermal scales.
Super Class pisces is divided into two classes:
- Chondrichthyes
- Osteichthyes
Chondrichthyes are Cartilagineous fishes. This class is also called Elasmobronchi. It has exclusively marine fishes with endoskeleton made of cartilage. Their skin has tiny shark enamel coated denticles called Placoid Scales.They are heterocercal and Mouth is present at ventral to tail fins.They have exposed 5 gills on each sides.
Example Shark, Ray fishes, Dog dish etc
<h2>_____________________________________</h2>These fishes are Bony Fishes. This group is also called Teleostomi, They are found in both marine and fresh water. Their endoskeleton is made up of bones. Their skin has thin bony plates called cycloid or ctenoid. Their gills are covered with outer skin called operculum. Tain fin is homocercal and mouth is present at anterior tip.
Examples Sea Horse, Gold fish, Eel etc
<h2>_____________________________________</h2><h2>- They have gill to breath
- Streamlined body to move in fast moving water
- All fishes are cold-blooded.
- Fins are present for locomotion
- Have hypertonic or hypotonic environment according to the environment they are present.
- They have great sense of smell
- They have air bladder to be bouncy
The main economical use of fishes as Nutritional Value. The commonly edible fishes are Salmon, Cat fishes, Mackrels, Carps etc. Fish is not only a source of proteins and healthy fats, but also a unique source of essential nutrients, including long-chain omega-3 fatty acids, iodine, vitamin D, and calcium. They also have religious, medicinal, industrial values.
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