Parasite Infestation in Macrobrachium rosenbergii from Sarawak (Kuching- Samarahan region)

Rizmanisha Jasmin, Ruzaiuddin (2022) Parasite Infestation in Macrobrachium rosenbergii from Sarawak (Kuching- Samarahan region). [Final Year Project Report] (Unpublished)

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Abstract

Macrobrachium rosenbergii has proven to be one of the important species in Malaysia, since it is a significant contributor to Malaysia's aquaculture sector, and as the source of food for the Sarawak people. However, due to parasite infestation, this species has been threatened with low productivity and quality. This current study focuses on the parasites infesting the M. rosenbergii and the correlation with the body size of the prawns obtained from Sarawak, precisely from the Kuching-Samarahan region. A total of 72 samples were dissected and processed in the lab to analyse their body length, weight and for the presence of parasites. Results found that eleven individuals were infesting about 15% (11 out of 72) of the samples which were identified as Probopyrus sp., Calanus sp., Nematode, and an unknown larva. The highest prevalence among these parasites is from Probopyrus sp. (6.94%), followed by Nematode (4.17%), Calanus sp. (2.78%), and unknown larva (1.39%). Majority of the infected prawns were categorised under the 111 - 120 mm interval, which is the shortest length group with an average weight of 17.91 g and none were infected from the bigger sizes prawns. The correlations between the parasite mean intensity and the prawn length (mm) were found to be negative for all of the parasites mentioned; Probopyrus sp. (r = - 0.725), Calanus sp. (r= -0.518), nematode (r= -0.646) and the unknown larva (r= -0.137). The study of M. rosenbergii from Sarawak requires more research to better understand its correlation with parasite infestation by determining the impact of the present water quality index of the researched areas on parasite prevalence.

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