Muricids are commercially important gastropods and are exploited primarily for shell craft industries. They also occupy a niche in ornamental keeping. Studies on the larval development of muricids in Indian waters are...Muricids are commercially important gastropods and are exploited primarily for shell craft industries. They also occupy a niche in ornamental keeping. Studies on the larval development of muricids in Indian waters are few. Hence, an attempt was made to study with a focus on the optimum requirements for captive brood maintenance;regional variation in egg laying, intracapsular development and to estimate production potential of individual brooder (the length/ weight ranged from 80 -?110 mm/49 -?169 g (average 94.875 ± 3.980 mm/111.625 ± 14.870 g) of Chicoreus virgineus var. ponderosa collected off Tuticorin coast, Gulf of Mannar. Experimental airlift water circulation system fitted in 1 t FRP tanks having an overturn of 300% water is found suitable for long term maintenance and maturation of brooders with near cent percent survival over a year. Spontaneous breeding commenced from June ’09. Eggs cases were ‘vase’ shaped and measured 1.2 -?1.5 cm in height. Egg case numbers varied between 110 and 140 and got reduced to 10 -?40 during October and increased in Nov & December. Number of eggs within the egg case was highly variable ranging from 100 -?380. Eggs were spherical, embedded in jelly mass within the egg case and measured 510 -?608 μ (578 μ). Intra capsular development is detailed and compared with the earlier report on this species from other areas of Indian coast. Development took nearly 20 days and only few free living juveniles measuring between 1.7 -?1.9 mm emerged and the rest of the eggs have functioned as “Nurse eggs”. Average net production potential of a single viable egg case was estimated to be 6.7 nos for Chicoreus virgineus var. ponderosa of Tuticorin coast of Gulf of Mannar.展开更多
Objective:To screen the antibacterial drugs from different solvent extracts of tissue and egg of marine gastropods Chicoreus ramosus against clinically isolated human pathogenic bacteria.Methods:Vibrio parehaemolyticu...Objective:To screen the antibacterial drugs from different solvent extracts of tissue and egg of marine gastropods Chicoreus ramosus against clinically isolated human pathogenic bacteria.Methods:Vibrio parehaemolyticus(J13300),Aeromonus hydrophilla(IDH1585),Salmonella typhi(C6953),Salmonella paratyphi A(C6915),Vibrio cholerae(IDH5439)and Escherichia coli(H10407)using standard well diffusion method and its minimum inhibitory concentration.Results:Different solvent extracts of Chicoreus ramosus was screened for their activity against egg inhibited the growth of the tested pathogenic bacterial strains.The minimum inhibitory concentration of both the extract ranged from 4 to 12 mg/mL.The study revealed that the acetone and chloroform extract of both the tissues and Conclusions:These results suggest that marine gastropods tissue and egg extract contains comparatively good antibacterial activity.展开更多
文摘Muricids are commercially important gastropods and are exploited primarily for shell craft industries. They also occupy a niche in ornamental keeping. Studies on the larval development of muricids in Indian waters are few. Hence, an attempt was made to study with a focus on the optimum requirements for captive brood maintenance;regional variation in egg laying, intracapsular development and to estimate production potential of individual brooder (the length/ weight ranged from 80 -?110 mm/49 -?169 g (average 94.875 ± 3.980 mm/111.625 ± 14.870 g) of Chicoreus virgineus var. ponderosa collected off Tuticorin coast, Gulf of Mannar. Experimental airlift water circulation system fitted in 1 t FRP tanks having an overturn of 300% water is found suitable for long term maintenance and maturation of brooders with near cent percent survival over a year. Spontaneous breeding commenced from June ’09. Eggs cases were ‘vase’ shaped and measured 1.2 -?1.5 cm in height. Egg case numbers varied between 110 and 140 and got reduced to 10 -?40 during October and increased in Nov & December. Number of eggs within the egg case was highly variable ranging from 100 -?380. Eggs were spherical, embedded in jelly mass within the egg case and measured 510 -?608 μ (578 μ). Intra capsular development is detailed and compared with the earlier report on this species from other areas of Indian coast. Development took nearly 20 days and only few free living juveniles measuring between 1.7 -?1.9 mm emerged and the rest of the eggs have functioned as “Nurse eggs”. Average net production potential of a single viable egg case was estimated to be 6.7 nos for Chicoreus virgineus var. ponderosa of Tuticorin coast of Gulf of Mannar.
基金Supported by Centre for Marine Living Resources and Ecology,Cochin,Ministry of Earth Sciences,New Delhi,India(Grant No.MoES/10-MLR/01/12).
文摘Objective:To screen the antibacterial drugs from different solvent extracts of tissue and egg of marine gastropods Chicoreus ramosus against clinically isolated human pathogenic bacteria.Methods:Vibrio parehaemolyticus(J13300),Aeromonus hydrophilla(IDH1585),Salmonella typhi(C6953),Salmonella paratyphi A(C6915),Vibrio cholerae(IDH5439)and Escherichia coli(H10407)using standard well diffusion method and its minimum inhibitory concentration.Results:Different solvent extracts of Chicoreus ramosus was screened for their activity against egg inhibited the growth of the tested pathogenic bacterial strains.The minimum inhibitory concentration of both the extract ranged from 4 to 12 mg/mL.The study revealed that the acetone and chloroform extract of both the tissues and Conclusions:These results suggest that marine gastropods tissue and egg extract contains comparatively good antibacterial activity.
