Abstract:
Nowadays sea bass, Lates calcarifer has become one of the most promising
commercial marine fish in Malaysia's aquaculture industry. In this study, a total
number of 40 sea bass from net floating at Semerak have been used to identify the
ectoparasites of the fish. Seven species of ectoparasite are found in examined sea
bass, they are from three big group namely 1) protozoan parasites; Cryptocaryon
irritans, Trichodina sp. and cysts of Henneguya sp., 2) parasitic crustacean;
Lernanthropus latis, Caligus sp., and Ergasilus sp., and 3) monogenetic trematodes;
Pseudorhabdosynochus sp.. The prevalence and mean intensity of Cryptocaryon
irritans was 65% and 132.5, Trichodina sp. 37.5% and 8, cysts of Henneguya sp. 10%
and 1.3, Lernanthropus latis was 95% and 14, Ca/igus sp. 60% and 12.3, Ergasilus
sp. 37.5% and 6.3, and lastly Pseudorhabdosynochus sp 57.5% and 29.9.
Ectoparasites infection is the reason for mass mortality of fish in Malaysia's
aquaculture industry. Hope, the information about this study might help us to generate
more information to reduce threats and risks to cultured sea bass.
