The economic viability of cultivating the seaweed Kappaphycus alvarezii, also known by the commercial name “cottonii,” on the southeastern coast of Brazil was evaluated in large-scale production systems with 13 polyvinyl chloride (PVC) rafts containing 11.44 km of tubular and family-size nets with 4 rafts and 3.52 km of nets. Deployment and operating costs and profitability ratios were estimated for three tonnes per raft production scenarios: (A) 4.0 (pessimistic), (B) 4.5 (normal conditions), and (C) 5.0 (optimistic). A sensitivity analysis simulated the loss of one crop among the five proposed growing cycles, as well as the variation in the number of rafts and selling prices for both systems. At a selling price of US$ 120.00 t⁻¹, the 13-raft, four-crop annual large-scale production system was impractical in all proposed productivity scenarios. In the family-size production system, at a selling price of US$ 120.00 t⁻¹, 4 rafts were not economically viable. Only the three scenarios that reached 11 rafts were viable, displaying, respectively, Internal Rates of Return (IRR) of 38.17%, 70.73% and 87.81%, a Payback Period (PP) of 31, 17 and 14 months with a Break-even Point (BP) at 78.41 tons of fresh algae. It is concluded that the activity is only economically viable on a small scale, carried out in a family-sized production system, starting with 11 rafts or 9.68 km of nets, compatible with an area of 2 ha established by the low impact aquaculture legislation in the region.

在巴西东南沿海的大型生产系统中，使用13个聚氯乙烯（PVC）筏板，其中包含11.44 km的管状和家庭用木筏，在大规模生产系统中评估了在巴西东南沿海种植海藻Kappaphycus alvarezii（也称为商品名“ cottonii”）的经济可行性。大小的网，带有4个木筏和3.52公里的网。估计每筏生产三吨的部署和运营成本以及获利率：（A）4.0（悲观），（B）4.5（正常情况）和（C）5.0（乐观）。敏感性分析模拟了五个拟议的生长周期中一种作物的损失，以及两种系统的木筏数量和售价的变化。售价120.00美元t ^-1，在所有拟议的生产力方案中，每年只有13条草稿，四作物的大规模生产系统是不切实际的。在家庭规模的生产系统中，当售价为120.00 t ^-1美元时，有4个木筏在经济上不可行。只有达到11个筏的三个方案才是可行的，分别显示内部收益率（IRR）为38.17％，70.73％和87.81％，投资回收期（PP）为31、17和14个月，收支平衡点（BP）为78.41吨新鲜藻类。结论是，该活动仅在小规模上经济可行，是在家庭规模的生产系统中进行的，从11个木筏或9.68公里的网开始，与低影响水产养殖立法确定的2公顷面积相适应。该区域。