Abstract. Muhtadi A, Pulungan A, Nurmaiyah, Fadlhin A, Melati P, Sinaga RZ, Uliya R, Rizki M, Rohim N, Ifanda D, Leidonald R, Wahyuningsih H, Hasani Q. 2020. The dynamics of the plankton community on Lake Siombak, a tropical tidal lake in North Sumatra, Indonesia. Biodiversitas 21: 3707-3719. The tidal lake is a very dynamic estuary ecosystem and very vulnerable to environmental stresses and disturbances. Plankton is an aquatic organism that is very easily affected by environmental pressures and disturbances. This study aimed to reveal the phenomenon of plankton dynamics in tropical tidal lakes in Indonesia. The study was conducted at Siombak Lake from September 2018 to August 2019. Data were collected at high and low tides every month during the full month. The data analysis included plankton abundance, diversity index, and the relationship between water quality and plankton with PCA and succession analysis. The results showed that in Siombak Lake was found 66 genera which consisted of 54 phytoplankton genera and 12 zooplankton genera. Plankton abundance is higher in parts of the lake (stations 1-8) than in the river (stations 9-11) at both high and low tide. Temporally it shows that plankton abundance is higher in the rainy season (Feb-Aug, outside May) than in the rainy season (Sep-Jan, and May). Spatially, plankton in Siombak Lake at high tide is more influenced by TSS, phosphate, and salinity, while at low tide, it is influenced by TSS, Water transparency, BOD, silicate, salinity, and dissolved oxygen. Temporally, plankton in Siombak Lake at high tide is more influenced by salinity, conductivity, Debit, TSS, and salinity, while at low tide, it is influenced by salinity, conductivity, turbidity, TSS, TDS, DO, BOD, and COD. Based on the plankton Frontier succession graph, it shows that Siombak Lake is included in stage 1 and stage 2. Stage 1 occurs before the rainy season (August-September) and the peak of the dry season (March-April).
Skipjack tuna Katsuwonus pelamis is one of the commercial fishes in Indonesia. This species is frequency caught by fishermen in Indian Ocean, North Sumatra Province. Therefore, the objectives of the present study were to identify endoparasitic worms and examine the infection level in skipjack tuna K. pelamis from North Sumatera Indian Ocean. Sampling was conducted in Horizon Private Fishing Port, Sibolga from 21 June to 5 July 2019. A total of 25 fish samples with weight ranges from 390 g to 670 g and total length from 29.3 cm to 34.6 cm. The identification of the worm was carried out in the laboratory using a stereo microscope. The results showed that there were eighth species of worms were found in intestine and stomach of the fish with varies level incidency, for example Echinorhynchus sp. and Rhadinorhynchus sp. with 100% intestinal incidences; Neoechinorhynchus sp.had 72% intestinal incidences; Leptorhynchoides sp. had 56% intestinal incidences; Pomphorhynchus sp. with 32% intestinal incidency; and Acanthocephalus sp. with 20% intestinal incidency. It is concluded that the Echinorhynchus sp. and Rhadinorhynchus sp. had higher incidency.
of endoparasitic worms in skipjack tuna (Katsuwonus pelamis) in Sibolga Waters. Sampling conducted in Debora Private Fishing Port, Sibolga for 20 fishes that object weighing 740 – 1200 gr and length within 37,2 – 41,4 cm. The identification process is carried out in the laboratory using a microscope 40x and 100x total magnification. The endoparasitic worms found are Echinorhynchus sp. (100% intestinal and 10% stomach insidences, 8,6 intensities), Acanthocephalus sp. (25% Intestinal insidences, 1,6 intensities), Rhadinorhynchus sp. (25% intestinal and 5% stomach insidences, 1,5 intensities), Leptorhynchoides sp. (25% intestinal insidences, 1 intensity), Neoechinorhynchus sp. (25% intestinal insidences, 1,4 intensities), Pomphorhynchus sp. (10% intestinal insidences, 1,5 intensities), and Apororhynchus sp. (10% intestinal insidences, 1 intensity).
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