Biometrics and Radiographic Studies on the teratology of Starfish (Pentaceraster affinis) from Thoothukudi Coast of Gulf of Mannar, Indi

Jagadis, I

Joshi, K K

Kalidas, C

Karuppasamy, K

Kavitha, M

Linga Prabu, D

Manojkumar, P P

Ranjith, L

Saravanan, Raju

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I BIOMETMCS AND RADIOGRAPHIC STUDIE,S ON THE TERATOLOGY OF , STARFISH (PENTACERASTER AWINIS) FROM THOOTHUKUDI COAST OF I GULF OF MANNAR, INDIA L RAMJI'J'H', R SARAVANAN'~CK.ALIDAS', 1. JAGADIS', D LINGA PRABU', M.WITHA~, K. KARUPPASAMY', K. K. JOSHI*. PPMANOXUMAR' "l'uticorin Research Centre, ICAR-CMFRI, Thoothukudi ?CAR-Central Marine Fisheries Research Institute, Kochi, Kerala 8 1' Abstract I Asteroidea (Phylum: Echinodennata) are pentamerous with five primary ai-nis but very few astcroids exhibit deviation. In tllc course of ecl~inoderm faunal investigation along Gulf of Mannar, two four armed abnomal starfish, Peritaceraster afirzis were encountered in the bottom set gillnet fishery (2017) along with thc no~lnal one (with five anns) from the Vellapatti fish landing centre of Thoothukudi, Southeast coast of India. The percentage abnormality is accounting to a tune of 0.02%. Biometric and radiographic illvestigation was made on the 5 and 4 armed specin~ens. The arm lengths (R, mouth to arm tip; r, mouth to inter radius end), arm breadth (b, ann base width) among the 5 and 4 rayed speciinens was not statistically significant (B0.05). The four aniled stai-fish had four radial plates and are usually symmetrical as in the case of five armed one. Howcvcr, in tlie obsesvcd specimens, the reduction in tlle number of anns (as abnonnal) are attributed to early stage of development and possibly a genetic basis. The possible rcasons for deviation of the location of madrcporitc and allus of abnormal four armed specimens from that of Carpenter letters system and results of I radiographic visualisatio~l were discussed claboratcly in the paper. I Keywords: Echinodemls, Autotoiny Regeneration, Symmetry, Ray, Pentanlerous TNJFU, FC&RI, Thoothukudi, 19-20 June 2018 a I/ 

Biometrics and Radiographic Studies on the teratology of Starfish (Pentaceraster affinis) from Thoothukudi Coast of Gulf of Mannar, India

http://eprints.cmfri.org.in/12915/1/National%20Seminar%20on%20Conservation%20and%20Sustainability%20of%20Aquatic%20Resources_CSAR_2018_L%20Renjith.pdf

Biometrics and Radiographic Studies on the teratology of Starfish (Pentaceraster affinis) from Thoothukudi Coast of Gulf of Mannar, India

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