| dc.creator | Gullian-Klanian,M | |
| dc.creator | Arámburu-Adame,C | |
| dc.date | 2013-03-01 | |
| dc.date.accessioned | 2019-05-03T13:27:23Z | |
| dc.date.available | 2019-05-03T13:27:23Z | |
| dc.identifier | https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0718-560X2013000100012 | |
| dc.identifier.uri | http://revistaschilenas.uchile.cl/handle/2250/87862 | |
| dc.description | The aim of this paper was evaluate the performance of Nile tilapia fingerlings (Oreochromis niloticus) raised at hyper intensive stocking density in a recirculating aquaculture system (RAS) with minimum water replacing. The experimental system was performed in a single-batch nursery system to obtain 50 g fish size in 60 days. Fish (2.07 ± 0.04 g) were stocked in triplicate at 400 (T1), 500 (T2) and 600 (T3) fish m-3 (0.84, 1.05, 1.22 kg m-3). RAS functioned with 12,000 L of recirculating water and 252 L day-1of water replacing (2.1% daily). The efficiency of the biofilter for removing the total ammonia nitrogen (TAN) was 48 ± 12.5 mg L-1. Stocking density did not affect significantly the survival (89.5 to 93.6%). The growth rate of T1 (0.96 g day-1; 5.01% day-1) and T2 (0.92 g day-1; 4.95 % day-1) was significantly higher than T3 (0.83 g day-1; 4.80% day-1). The specific growth rate (SGR) of T1 was 41% influenced by temperature. For T2 and T3 the SGR were influenced by the variation of dissolved oxygen (DO) that explained 47 and 44% of the fish weight variation, respectively. The SGR from T3 was also affected by the concentration of ammonia nitrogen (31%). The high stocking density affected the overall size of fish and the size homogeneity, but had no negative effect on the length-weight relationship (L-W). Data support the conclusion that fingerling stocked at 400 and 500 fish m-3 shows high performance during 9-weeks when the biomass not exceed 37 kg m-3. At this time fish have reached the desired final nursery weight (50 g) for transfer to grow-out facilities. | |
| dc.format | text/html | |
| dc.language | en | |
| dc.publisher | Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar | |
| dc.relation | 103856/vol41-issue1-fulltext-12 | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.source | Latin american journal of aquatic research v.41 n.1 2013 | |
| dc.subject | Nile tilapia | |
| dc.subject | recirculating aquaculture system | |
| dc.subject | low water exchange | |
| dc.subject | intensification | |
| dc.title | Performance of Nile tilapia Oreochromis niloticus fingerlings in a hyper-intensive recirculating aquaculture system with low water exchange | |
