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Ichthyology is the branch of zoology devoted to the study of fish, including bony fish (Osteichthyes), cartilaginous fish (Chondrichthyes), and jawless fish (Agnatha). According to FishBase, 33,400 species of fish had been described as of October 2016, with approximately 250 new species described each year.
Fish migration is mass relocation by fish from one area or body of water to another. Many types of fish migrate on a regular basis, on time scales ranging from daily to annually or longer, and over distances ranging from a few metres to thousands of kilometres. Such migrations are usually done for better feeding or to reproduce, but in other cases the reasons are unclear.
Blenny is a common name for many types of fish, including several families of percomorph marine, brackish, and some freshwater fish sharing similar morphology and behaviour. Six families are considered "true blennies", grouped under the order Blenniiformes; its members are referred to as blenniiformids. About 151 genera and nearly 900 species have been described within the order. The order was formerly classified as a suborder of the Perciformes but the 5th Edition of Fishes of the World divided the Perciformes into a number of new orders and the Blenniiformes were placed in the percomorph clade Ovalentaria alongside the such taxa as Cichliformes, Mugiliformes and Gobiesociformes.
The Ganges shark is a critically endangered species of requiem shark found in the Ganges River and the Brahmaputra River of India and Bangladesh. It is often confused with the more common bull shark, which also inhabits the Ganges River and is sometimes incorrectly referred to as the Ganges shark. The genus is currently considered to contain three recent species; genetic evidence has shown that both the Borneo river shark and Irrawaddy river shark should be regarded as synonyms of the Ganges shark, expanding the range of the species to Pakistan, Myanmar, Borneo, and Java. While the other members of the genus Glyphis occur in coastal marine waters as well as rivers, the Ganges shark is found only in fresh water, making it the world's only exclusively freshwater shark. The species remains poorly known and very rare.
Game fish, sport fish or quarry refer to popular fish species pursued by recreational fishers, and can be freshwater or saltwater fish. Game fish can be eaten after being caught, preserved as taxidermy, or released after capture. Some game fish are also targeted commercially, particularly less bony species such as salmon and tuna.
The black heron, also known as the black egret, is an African heron. It uses its wings to form a canopy when fishing.
Theodore Philip Stephanides was a Greek-British doctor and polymath, best remembered as the friend and mentor of Gerald Durrell. He was also known as a naturalist, biologist, astronomer, poet, writer and translator.
Freshwater fish are fish species that spend some or all of their lives in bodies of fresh water such as rivers, lakes and inland wetlands, where the salinity is less than 1.05%. These environments differ from marine habitats in many ways, especially the difference in levels of osmolarity. To survive in fresh water, fish need a range of physiological adaptations.
The largetooth sawfish is a species of sawfish in the family Pristidae. It is found worldwide in tropical and subtropical coastal regions, but also enters freshwater. It has declined drastically and is now critically endangered.
Pelasgus stymphalicus, also known as the dáska or stymphalia minnow, is a threatened species of small freshwater fish. It is a short-lived species, and reaches a maximum length of 12 cm (4.7 in).
Lepidocephalichthys jonklaasi, known as the Jonklaas's loach or the spotted loach, is an endemic fish species restricted to the wet zone of Sri Lanka. The species was first recorded from the Wilpita area. It is currently known from 12 locations in the wet zone including Beraliya, Dombagaskandha, Madakada, Gilimale, Hiyare, Kottawa, Kanneliya, Weddagala, Nakiyadeniya, Pahiyangala and Boralugoda. It is recorded from a wide range of altitudes. Due to its restricted range and the threats to its habitat Lepidocephalichthys jonklaasi, is listed as an Endangered species. The species has already begun to disappear from some of the sites mentioned above due to destruction and fragmentation of its habitat and many other threats that are operating on the species.
Scardinius is a genus of ray-finned fish in the family Cyprinidae commonly called rudds. Locally, the name "rudd" without any further qualifiers is also used for individual species, particularly the common rudd. The rudd can be distinguished from the very similar roach by way of the rudd's upturned mouth, allowing it to pick food items such as aquatic insects from the surface of the water with minimal disturbance.
Salmo peristericus, or the Prespa trout is a variety of trout, a freshwater fish in the family Salmonidae. It is endemic to the Lake Prespa watershed at the border area of Greece and North Macedonia.
Maurice Kottelat is a Swiss ichthyologist specializing in Eurasian freshwater fishes.
The Aquarium of Rhodes, also known as the Hydrobiological Station of Rhodes, is a research centre, aquarium and museum in Rhodes, Greece. It was built in the 1930s, when the island was under the Italian rule and is currently administered by the Hellenic Centre for Marine Research.
Freshwater biology is the scientific biological study of freshwater ecosystems and is a branch of limnology. This field seeks to understand the relationships between living organisms in their physical environment. These physical environments may include rivers, lakes, streams, ponds, lakes, reservoirs, or wetlands. Knowledge from this discipline is also widely used in industrial processes to make use of biological processes involved with sewage treatment and water purification. Water presence and flow is an essential aspect to species distribution and influences when and where species interact in freshwater environments.
Eels are ray-finned fish belonging to the order Anguilliformes, which consists of eight suborders, 20 families, 164 genera, and about 1000 species. Eels undergo considerable development from the early larval stage to the eventual adult stage and are usually predators.
The Indian mud moray eel, is a moray eel found in the western Pacific and Indian Oceans. It was first named by Hamilton in 1822, and is also commonly known as the freshwater moray or freshwater snowflake eel.
The wildlife of Greece includes the diverse flora, fauna, and funga of Greece, a country in southern Europe. The country is mostly mountainous with a very long, convoluted coastline, consisting of peninsulas and many islands. The climate ranges from Mediterranean through temperate to alpine, and the habitats include mountains, hills, forests, rivers, lakes, coasts and cultivated land.
References
- ↑ Economidis, P., S.; Check List of Freshwater Fishes of Greece: Recent Status of Threats and Protection; Hellenic Society for the Protection of Nature, Athens, 1991 (Published with the Financial Assistance of the Programme for the Creation of a Data Bank for the Natural Environment of Greece)