4. International Seminar of Fisheries and Marine (2ndISFM 2013)

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Browsing 4. International Seminar of Fisheries and Marine (2ndISFM 2013) by Author "Azrita"

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    Loading and Distribution of Organic Materials in Maninjau Lake
    (2016-03-22) Syandri, Hafrijal; Azrita; Junaidi
    Maninjau Lake utilization for the development of fish farming system floating net (KJA) already exceeded the carrying capacity of the number KJA waters in 2012 as many as 15 860 plots are used to maintain tilapia and carp, so the impact of organic matter pollution load is high enough. Water quality research and loading of organic matter and its distribution has been carried out in Maninjau Lake in July 2013. Quality of the surface water dissolved oxygen at each station showed almost the same conditions ranged from 5.70 to 6.77 mg/L, except for dissolved oxygen at a depth of 15 meters ranged from 3.26 to 4.12 mg/L, pH ranged between 8-10, low brightness range between 1.2-2.0 meters and electrical conductivity ranges quite high ranging from 33.66 to 45.32 ms/cm. Total organic content (TOM) on Koto Malintang station at 19.94 mg/L, Koto Kaciek station at 16.69 mg/L, Bayur 9.32 mg/L, the station on the lake outlets Hydropower Intake of 9.35 mg/L and Sigiran station at 14.10 mg/L. TOM accumulation in Maninjau Lake was 10.59 mg /L or 53.10% of the incoming load of KJA. KJA organic load of waste since 2001-2012 in Maninjau Lake have accumulated as much as 167,790.91 tons per year as the average load 13982.57 tons.
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    Trophic Status and Potential Production Estimates of Fish Littoral Waters Maninjau Lake West Sumatra
    (2016-03-30) Junaidi; Syandri, Hafrijal; Azrita; Basri, Yuneidi
    Tropics status is a picture of the fertility of the water, while fish production potential in an aquatic ecosystem is the ability of these waters to produce fish. Research on tropics status and estimates of fish production in littoral waters Maninjau was carried out in March and July 2013 with the purpose of the study to determine the tropics status of the lake littoral waters and fish production estimates. The results show that in March 2013 the value of the average phosphorus level was 418 ± 55.40 mg / L, water transparency 1.7 ± 0.35 meters, chlorophyll-a levels of 256 ± 0.38 mg / L in order to obtain the average value of the index status trophics of 76.61 ± 2.02 with the value of the trophic waters classified as severe. Meanwhile, in July 2013 the average value of 605 ± 4.79 Phosphorus levels ug / L, water transparency 1.3 ± 0.18 m, chlorophyll-a levels of 271.3 ± 2.65 mg / L in order to obtain the average value index of tropics status amounted to 78.62 ± 1.15 with the value of the trophics waters classified as severe. The estimated value of fish production in March 2013 by an average of 45.51 ± 2.81 kg / ha / year and in July 2013 an average of 44.99 ± 2.96 kg / ha / year