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Add To Calendar 28/04/2016 11:20:0028/04/2016 11:40:00Africa/JohannesburgAsian-Pacific Aquaculture 2016ADDITION OF PHOSPHATE OR NITRATE BEFORE STOCKING INCREASE SURVIVAL RATE IN BLACK TIGER SHRIMP PENAEUS MONODON NURSERY VIP Room 2The World Aquaculture Societyjohnc@was.orgfalseanrl65yqlzh3g1q0dme13067DD/MM/YYYY


Ibnu Sahidhir*, Thaharah Ramadhani, Vera Novita, Muhammadar, Irma  Dewiyanti
Brackishwater Aquaculture Development Center of
Ujung Batee, Aceh, Indonesia

Nitrogen and phosphorus are two macro mineral that highly determine shrimp pond productivity. Moreover, pond water quality closely correlate to types, concentration and ratio of nitrogen and phosphorus. This study aimed to identify the dynamics of biological and chemical water quality variables when treated by ammonium sulfat (ZA), potasium nitrate (KNO3), and sodium dihidrogen phosphate (NaH2PO4)  and its correlation to survival rate and growth in 21 days of culture. To anticipate high variation of nitrogenic substances, more replication was provided. Nitrogen test consisted of 4 treatment and 5 replication i.e. control, 2,5 ppm KNO3, 2,5 ppm ZA, 2,5 ppm KNO3 + 2,5 ppm ZA.  Phosphate test consisted of 4 treatment and 3 replication, i.e. 0 ppm NaH2PO4, 1 ppm NaH2PO4, 5 ppm NaH2PO4, 10 ppm NaH2PO4.  After treatment, seawater (32 ppt) was let down for a week. Shrimp post larva stocked with density 50 ind/25 l, feeding frequency 3 times/day and feeding rate 1,5 ppm.

The result revealed that survival rate of KNO3 and KNO3+ZA (SR 75% dan SR 73%) were better than control and ZA (SR 68% dan SR 58%) (Figure 1). One and 5 ppm NaH2PO4 achieved better survival rate (SR 90% dan SR 94%) than 0 dan 10 ppm (86% and 76%) and also the length (Figure 2). Total bacteria increase sharply for control and ZA (80 and 100 times) that was higher than KNO3 and KNO3 + ZA (40 and 45 times). Total vibrio increased sharply in the first week after stock, i.e. 44 times (control), 72 times (KNO3), 107 times (ZA) and 155 times (KNO3 + ZA). Total vibrio developed constantly when NaH2PO4 concentration increased. Control and ZA revealed more species of phytoplankton i.e. 25 and 21 species but KNO3 and ZA only 15 and 12 species. Sixteen species of phytoplankton was found in 0 ppm NaH2PO4 and decreased become 8-10 species when concentration of NaH2PO4 increased to 1-10 ppm. One ppm and 5 ppm NaH2PO4  revealed 75% of the same phytoplankton. Survival rate likely correlated with total bacteria and phytoplankton species. It could be concluded that 2,5 ppm KNO3 and 1-5 ppm NaH2PO4 showed better shrimp and water quality performance than the other treatment.

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