Browsing by Author "Azrita"

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    Karakteristik Populasi Dan Habitat Pemijahan Ikan Bilih (Mystacoleucus padangensis Blkr) Di Danau Singkarak, Sumatera Barat
    (2015-07-31) Syandri, Hafrijal; Aryani, Netti; Azrita
    Fish Bilih a native fish of Singkarak Lake, one of the world‘s species, important protected because it is endemic and has important economic value._Study of population characteristics and Bilih fish spawning areas on Singkarak Lake has done a series of studies in January and December 2010._The purpose of this study is to reveal the characteristics of spawning fish populations and and their ecosystem. The research proves that the size of mature female fish gonads Bilih range in size of 70-109 mm with a weight of 6.37 to 8.68 grams and males 70-89 mm and weighs 4.46 to 6.60 grams. Female fish to spawn more dominant on the size of 70-79 mm and males 60-69 mm. Percentage of female fish to spawn each research station ranged from 68.37 - 75.65% and males 73.39 - 78.31%._Bilih spawning fish populations by conducting migration from lakes to rivers, among others, into the river Sumpur,Paninggahan and Baing every day starting at 16:00 until 23:00 am with the amount of thousands of tail. Characteristics of spawning habitat with river flow velocity 10-15 m / sec, water depth of 20-40 cm, bottom substrate consists of gravel and karakal._Based on this, the fish are reotaksis Bilih is doing spawning afternoon until the evening with the stimulation current, the basic substrate of gravel and karakal
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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