Anterior boundary of each orbit is formed by ectoethmoid, posterior boundary is formed by the sphenotic, dorsal boundary is made by frontal and ventral boundary is formed by alisphenoid and orbitosphenoid. In front of auditory region the cranium is excavated on each side by a large orbit. The fifth arch is reduced to a single bone on each side. Rohu (Labeo rohita) is the most important among the three Indian major carp species used in carp polyculture systems. In the last 3 or 4 trunk vertebrae the parapophyses are fused. Around focus there are concentric rows of ridges called circulii which are used to count the age of fishes. External Structures of Rohu: The Rohu fish has a spindle-shaped body measuring up to 1 m in length and weighing about 20-25. kg. Which of the following animals has a tetramorphic colony ? Identify the parts a,b,c,d,e,g and g in the diagram of Labeo rohita Books. Order-Cypriniformes. ADVERTISEMENTS: Catla Catla (Theila): It is a fresh water fish inhabiting all the rivers in India. The proximal segment of each somactidia is large and dagger-shaped, and called axonast (interspinous bone). In: P. Keshavanath & K.V. They serve as a sieve to prevent the escape of food through the gill-slits and to protect the gill filaments. The outgrowths corresponding to the parapophyses are fused with the centrum and unite in the middle ventral line, forming a haemal arch. Palatoquadrate is homologous with the upper jaw of dogfish. The lower jaw is formed of dentaries, angulars and articulars, Articular is formed by the ossification of Meckel’s cartilage and articulates with the quadrate of the upper jaw. These pieces are the two anterior most elements of Weberian apparatus. These are anterior preorbital, posterior postorbital, supraorbital and postfrontal are of the dorsal side bones and infraorbital forms the anteroventral part of the ring. Scales are cycloid type which are thin overlapping bony plates, partly covered by skin. Identify the wrong statement with reference to the gene T that controls ABO blood groups. A more sensitive apparatus exists in the carps {e.g., Labeo) and siluroids (order Ostariophysi), in which a chain of bones connects the swim-bladder with the internal ear on either side, forming the Weberian apparatus. Anal fin has a series of eight fin rays supported by seven somactidia. Camouflage of Chameleon is associated with, The endocrine gland of insects, which secretes the juvenile hormone, is. On the dorsal side of urostyle are present two epiurals and a radial, and on its ventral side are present nine hypiurals. It lies in between scaphium and tripus. The vomer is a quadrangular bone placed beneath the mesethmoid in front of the parasphenoid on the ventral side of the skull. The result indicated 1387 non-redundant (184 contigs and 1203 singletons) putative transcripts with an average length of 542 bp. Somactidia are parallel bony rods found embedded within the body muscles. 9 (1/8); A. Content Guidelines 2. Mouth shape and tooth structure vary greatly in fishes, depending on the kind of food normally eaten. Chordata, Osteichthyes, Rohu Fish, Skeleton of Rohu Fish, Vertebrates, Zoology. Match the animals listed in Column I with their of nature of blood listed in Column II. Choose the correct pair from the following. Externally to these is a very large investing bone, the cleithrum, extending downwards under the throat. (ii) The second or hyoid arch forms the suspensorium and hyoid cornu. Suspensorium is formed of two bones, the hyomandibular and symplectic. Amazing Health Benefits of Rohu Fish” Having fish thrice a week can keep you on top of your health. Tripus is the modification of transverse process of third vertebra, and it is the last element of Weberian apparatus. The first four trunk vertebrae have no parapophyses. Taxonomy position: Phylum- Chordata. Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students. Five small orbital bones form the orbital ring. Hyoid cornu is composed of paired interhyal, epihyal, ceratohyal, hypohyal and a median unpaired basihyal. 16-18; P 2. The interopercular pits between the lower portions of the three preceding bones, and is attached by ligament to the angle of the mandible. Labeo Rohita (Rohu): It is found in clear and sluggish rivers and streams. Before publishing your Notes on this site, please read the following pages: 1. Family- Cyprinidae. Lakra and Krishna (1994) reported G-banded karyotypes in Indian major carps. Local name: Kalibaus, Baus, Kalia. At the free edges of fins are also present unbranched horny actinotrichia. It is palatable and is liked by the Indian population (Figs. These are the gill-rakers. 7 Diseases Infection with Aphanomyces invadans is an OIE-reportable disease. It has every high food value and commercial importance. Which of the following is respiratory organ of scorpion ? Choose the correct answer. India is by far the largest producer of rohu, followed by Bangladesh and Myanmar. Each has a deep nasal pit which lodges the nasal sac. Each half is formed of large, flat bone, the pelvic bone (basipterygium), lying in the middle line in the ventral body wall. Privacy Policy3. They are of two types- spines (single ray) and soft rays (segmented rays). They are more numerous than the centra, and three or four haemal arches are attached to the urostyle. ADW doesn't cover all species in the world, nor does it include all … Labeo is a freshwater bony fish found in lakes, ponds, and rivers. Through this run the caudal artery and vein. Temporal region or sphenoidal region is further divided into: (a) Frontal region is formed of frontal bones on the dorsal side (also forms the roof of cranium). The first four trunk vertebrae are greatly changed since these vertebrae connect the swim- bladder with the internal ear. Dorsal fin is supported by 15 or 16 lepidotrichia placed on 14 somactidia. Accessed at https://animaldiversity.org.

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