What is the systematic position of Rohu fish?
The rohu, rui, or roho labeo (Labeo rohita) is a species of fish of the carp family, found in rivers in South Asia….
| Rohu | |
|---|---|
| Order: | Cypriniformes |
| Family: | Cyprinidae |
| Subfamily: | Labeoninae |
| Genus: | Labeo |
What are the characteristics of labeo rohita?
Labeo rohita is characterised by having no lateral lobes in the snout. Two nostrils are present on the dorsal side of the snout. The mouth is a crescentic transverse opening bounded by thick fringed lips. Teeth are absent in the jaws.
What is the crayfish circulatory system?
The circulatory system of the crayfish is an open system where the blood is contained in vessels for only part of the system. The heart is located in a pericardial sinus located in the upper part of the thorax (a sinus is a sac or cavity). The heart pumps the blood into the arteries.
Why is the heart of labeo rohita known as venous heart?
The heart is called the venous heart since only deoxygenated blood circulates through the various parts of the heart.
How can we identify Labeo rohita?
Body bilaterally symmetrical, moderately elongate, its dorsal profile more arched than the ventral profile; body with cycloid scales, head without scale; snout fairly depressed, projecting beyond mouth, without lateral lobe; eyes dorsolateral in position, not visible from outside of head; mouth small and inferior; lips …
What is subclass of Labeo rohita?
CLASSIFICATION OF LABEO ROHITA : ROHU Division :- GNATHOSTOMATA ( Jaws and paired appendages present ). Class :- OSTEICHTHYES ( Bony fishes ). SUB-CLASS :- ACTINOPTYERGII ( Ray finned fish ).
What is the habitat of Labeo rohita?
Labeo rohita takes small percentages of mud which contains organic matter and various salts. This specie is available throughout Bangladesh. Ponds, rivers, rivulets are its main habitats (Bhuiyan, 1964).
Do crayfish have central nervous system?
The central nervous system of crayfish consists of a chain of segmental ganglia that are linked by cables of intersegmental axons. Each ganglion contains a highly-ordered core of longitudinal tracts, vertical tracts, commissures, and synaptic neuropils.
What is the body symmetry of a crayfish?
Bilateral symmetry
Acta Biol Hung.
Can you tell why Piscian heart is called a venous heart?
A fish’s heart is called a ‘venous heart’ because the heart receives blood from veins and sends it to the gills for oxygenation. The heart is two-chambered and performs single circulation where it receives and pumps only deoxygenated blood.
Who Discovered closed circulatory system?
William Harvey
Closed circulatory: Blood is circulated through the closed network of vessels of distinct size and thickness. Example: Vertebrates. The circulation of blood in the closed circulatory system was given by William Harvey.
How will you identify Catla Labeo and Mrigal write only about major body features?
All fins in catla were found darkish in colour. In case of mrigal, pectoral, pelvic and anal fins were found to be orange and rest of the fins darkish in colour. The only coloured fin in rohu was the pelvic fin which was reddish in appearance.
What are the characteristics of Labeo rohita?
The snout is depressed and projects beyond the jaws. Labeo rohita is characterised by having no lateral lobes in the snout. Two nostrils are present on the dorsal side of the snout. The mouth is a crescentic transverse opening bounded by thick fringed lips. Teeth are absent in the jaws. The eyes are prominent and are lidless.
What is the venous system of rohu?
The venous system of Rohu consists of the systemic veins and the portal veins. These veins directly or indirectly convey the deoxygenated blood from the different parts of the body to the heart. The blood is carried to the sinus venosus by right and left ductus Cuvieri.
How many nostrils does a leopard Labeo rohita have?
Labeo rohita is characterised by having no lateral lobes in the snout. Two nostrils are present on the dorsal side of the snout. The mouth is a crescentic transverse opening bounded by thick fringed lips.
What type of capillaries are present in the lamellae of Labeo?
These lamellae contain capillaries of afferent and efferent branchial arteries. The four pairs of gills are borne on the first four branchial arches. In Labeo and other teleosts the gill-filaments are attached to a very much reduced interbranchial septum.