Abstract
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.
Highlights
Muricids are commercially important gastropods and are exploited by fishermen for shell craft industries
Few studies have been reported on buccinid gastropod Babylonia spirata, on spawning and larval development [2] and larval development and seed production [3]
Patterson et al [1] has reported the feasibility of culturing spiral Babylon, Babylonia spirata in Tuticorin
Summary
Muricids are commercially important gastropods and are exploited by fishermen for shell craft industries. Few species belonging to the genus Chicoreus are listed as endangered under Wild life Act 1972. The knowledge on the life cycle of most of the marine gastropods are lacking in India though they have considerable scientific and economic importance [1]. Few studies have been reported on buccinid gastropod Babylonia spirata, on spawning and larval development [2] and larval development and seed production [3]. 1957 [4], has studied and reported the egg mass and larval development of gastropods including C. virgineus from Palk Bay and GoM. The spawning season [5] and the larval development of Chicoreus ramosus from Portonovo waters has been reported by Ramesh et al [6]. Experimental culture of C. virgineus off Portonovo coast was studied by Ramesh et al [6]
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