Portal de Periódicos da CAPES

Growth and nutrient uptake by Palmaria palmata integrated with Atlantic halibut in a land-based aquaculture system

2014; Korean Society of Phycology; Volume: 29; Issue: 1 Linguagem: Inglês

10.4490/algae.2014.29.1.035

2093-0860

Peter Corey, Jang K. Kim, J. Duston, David J. Garbary,

Aquaculture Nutrition and Growth

Palmaria palmata was integrated with Atlantic halibut Hippoglossus hippoglossus on a commercial farm for one year starting in November, with a temperature range of 0.4 to 19.1°C.The seaweed was grown in nine plastic mesh cages (each 1.25 m 3 volume) suspended in a concrete sump tank (46 m 3 ) in each of three recirculating systems.Two tanks received effluent water from tanks stocked with halibut, and the third received ambient seawater serving as a control.Thalli were tumbled by continuous aeration, and held under a constant photoperiod of 16 : 8 (L : D).Palmaria stocking density was 2.95 kg m -3 initially, increasing to 9.85 kg m -3 after a year.Specific growth rate was highest from April to June (8.0to 9.0°C), 1.1% d -1 in the halibut effluent and 0.8% d -1 in the control, but declined to zero or less than zero above 14°C.Total tissue nitrogen of Palmaria in effluent water was 4.2 to 4.4% DW from January to October, whereas tissue N in the control system declined to 3.0-3.6%DW from April to October.Tissue carbon was independent of seawater source at 39.9% DW.Estimated tank space required by Palmaria for 50% removal of the nitrogen excreted by 100 t of halibut during winter is about 29,000 to 38,000 m 2 , ten times the area required for halibut culture.Fifty percent removal of carbon from the same system requires 7,200 to 9,800 m 2 cultivation area.Integration of P. palmata with Atlantic halibut is feasible below 10°C, but is impractical during summer months due to disintegration of thalli associated with reproductive maturation.