Found 3 Documents

Plancton Population Dynamics in Area Fishing Ground of Tiger Prawn Post Larvae and Milk Fish Fry on Coastal Water of Suppa Distric Pinrang Regency, South Sulawesi Umar, Nur Asia; Kaswadji, Richardus F.; Damar, Ario; Muchsin, Ismudi; Nurjaya, I Wayan
Forum Pasca Sarjana Vol 32, No 2 (2009): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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This research to study relation between environment parameter, plankton abundance and primary productivity with abundance of tiger prawn post larvae and milk fish fry, calculates plankton predating rate speed by tiger prawn post larvae and milk fish fry and other larva and studies plankton population dynamics, tiger prawn post larvae and milk fish fry before, at the time and after peak season.  Result of research indicates that some environment parameters significant differs according to observation period and season.  Highest abundance of tiger prawn post larva, milk fish fry and other larva reaches to 29067, 7733 and 54400 ind/1000 m3. Highest grazing rate to population of phytoplankton and plankton (phytoplankton + zooplankton) found when predator consisted of tiger prawn post larva, milk fish fry and other larva with grazing rate up to 125 cells/liter/hour and 129 plankter /liter/hour respectively.  Highest predating rate to zooplankton population when predator consist of tiger prawn post larva and milk fish fry and there is phytoplankton as their prey up to 12 individual/liter/hour.  The certain plankton species significant correlation and estimated as natural food of tiger prawn post larva and milk fish fry that is some types of diatom and crustaceae from zooplankton.  Plankton population dynamics especially controlled by predator by tiger prawn post larva, milk fish fry and other larva, while influence of environment parameter is small relative. Abundance of each phytoplankton and zooplankton ranged from 583-28563 cells/liter and 22-3413 ind/liter.  Average abundance of phytoplankton and zooplankton significant differs higher at peak season compare  before and after tiger prawn post larva and milk fish fry season. Predator-prey relation between phytoplankton and zooplankton shows phase change which succession between phytoplankton controls to zooplankton phases with zooplankton control to phytoplankton.  Abundance of plankton influences abundance of population of tiger prawn post larva and milk fish fry especially after peak season.  There is concordance of time between peak abundance of tiger prawn post larva and milk fish fry and other larva with peak abundance of phytoplankton and zooplankton.   Key words : population dynamics, predating, predating rate, predator, prey, phytoplankton, zooplankton, tiger prawn post larva, milk fish fry, other larva, Pinrang
TORANI: Journal of Fisheries and Marine Science Vol 26, No 1 (2016)
Publisher : Marine Science and Fisheries Faculty, Hasanuddin University

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Study aim was to determine bioecology aspect of Batu-Batu and Walanae River for supporting aquacultureacitivies at Tempe Lake. Batu-Batu and Walanae Rivers were 2 out of 8 river where affected water quality ofTempe Lake. Research was conducted for 7 months and sampling was conducted for 5 times. Physical waterquality parameters were measured in situ while chemical, primary productivity and nutrients parameterswere analysed at laboratorium. Results showed that range of temperature and pH were 30.5 – 31.7oC and7.49 – 7.90, respectively. Range of phytoplankton and zooplankton abundance account for 512 – 2220 cell/Land 40 – 140 ind/L, repectively. Consentration nitrate was range 0.0015 – 0.0452 mg/L, while consentrationphosphate was range of 0.015 – 0.1340 mg/L Chlorophyll a concentration was range 0.007 – 2.550 mg/Land primary productivity had range account for 0.10 – 0.89. Based on water quality parameter concludedthat Batu-Batu and Walanae River had a significant effect on abundance of phytoplankton and primaryproductivity. Phosphate and nitrate concentration significantly affected on growth of phytoplankton andzooplankton, so this could be supported for aquaculture activities.Keywords: Temperature, pH, nitrate, phosphate, Walanae and Batu-Batu River and Tempe Lake.
Penyusunan Model untuk Penangkapan Berkelanjutan Ikan Pelagis dengan Pendekatan Jenjang Trofik di Selat Makassar Kaswadji, Richardus; Hatta, Muhammad; Umar, Nur Asia
Jurnal Natur Indonesia Vol 12, No 01 (2009)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

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Observations on pelagic fish catch activities using bagan Rambo in Makassar Strait had been conducted in 2005and 2006 to obtain physical, chemical, and biological data and their processes in the operation of bagan Rambo inthe observation sites. The objective of the study was to overcome the overfishing problems which have beenhappenning in Makassar Strait, using a model of the trophic level approaches. Nine observation stations were setin three transects perpendicular to the coast. The measurement of physical, chemical, and biological parameterswere conducted monthly. Biological parameters measured were chlorophyll-a, and the abundance of phytoplanktonand zooplankton. Phytoplankton primary productivity, grazing mortality of phytoplankton by zooplankton, numberof catch of fish, and fish feeding habit were also measured. Run of the built model based on the data obtainedshowed that with the present catch-pressure (assuming that this was the start of catching operation), there wouldbe an overfishing starting in the 26 th or 27th month onward. Meanwhile, if the catch were half of the present, thenthere would be an overfishing in the 31 st or 32nd month, but would back to the sustainable production months afterthat. The model is still being developed by finding and adding more accurate data and parameters.