Abstract
Habitat the gonggong conch (Laevistrombus turturella) also known as Dog conch is a species from the Gastropod class that can be found in shallow waters with muddy sand substrate. In Kepulauan Riau Province, these animals are hunted by fishermen to sell to consumers since gonggong conch is a favourite culinary in this province. The availability of conch in the market has only relied on natural catches. The high consumption and natural fluctuations have decreased the conch population. To maintain the sustainability of the dog conch, it is necessary to carry out the cultivation activities. The cultivation begins with the selection of quality broodstock. The gonggong conch of natural origin needs to be determined before cultivation, in order to prevent the entry of disease in the cultivation system i.e. parasites. This study includes the determination, prevalence and infection intensity of endoparasites in conch from Madong Bay, Tanjungpinang. The results showed that the total length of the conch shells ranged from 55.5 to 79.5 mm with an average length of 67.72 mm and a frequency mode of 64.6 mm. The sex ratio between male and female conch is 1:1.1 (not ideal) n=30. Two kinds of parasites were found in the digestive tract of gonggong conchs are conoidacid oocysts and trematode sporocysts. The number of endoparasites, prevalence and intensity in wild caught has high numbers involving conoidacid oocysts (prev=100%; I=48.23 ind/conch) and trematode sporocysts (prev=100%; I= 135.33 ind/conch). It was concluded that the level of endoparasites infection in the dog conch from the Madong Bay was categorized as moderate-to-severe.
Highlights
The gonggong conch (Laevistrombus turturella) is a type of sea conch which is a soft-bodied animal from the gastropod class that mostly lives on the coast of Bintan Island, Kepulauan Riau Province
The gonggong conch population in the waters of Bintan Island and its surroundings has experienced "growth overfishing", where the population of this animal is unable to face the pressure of collection by the population, because its growth is relatively slow while the availability of stocks only relies on natural catches
The value of the morphometric mode proportion of the gonggong conch's length is 64.60 mm with a sex ratio of 1:1.1 [3] reported that the sex ratio of male and female gonggong conchs in the waters of Madong bay was not balanced since the number of male gonggong conchs tended to be not the same as the number of females gonggong conchs
Summary
The gonggong conch (Laevistrombus turturella) is a type of sea conch which is a soft-bodied animal from the gastropod class that mostly lives on the coast of Bintan Island, Kepulauan Riau Province. In this area, gonggong conch is a leading fishery commodity with a high level of consumption in addition to fish and crabs. Parasites have an impact on reducing body weight of biota, body resistance and quality These conditions trigger secondary infection by other pathogens and even lead to death. There are no available reports regarding the type and distribution of parasites in gonggong conch and addressing the dangers that arise from parasitic attacks. This study aims to determine the prevalence and degree of parasitic infection of the endoparasite group in gonggong conch from the waters of Madong Bay, Tanjungpinang
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