Assessment of a Semi-Closed, Renewable Resource-Based Aquaculture System

摘要

A schematic overview of solar aquaculture dynamics is presented using an informal model which guided the experimentation to impove overall system efficiency. Limitations of algal-based purification for acceptable winter fish yields in the Ark bioshelters proved problematic. Research suggests that (1) solar aquaculture in bioshelters can be successful during the winter season, and (2) system improvement can be assessed more effectively by expanded quantification of algae, bacteria, detritus, and total nitrogen flow. The outside experiments of late summer and fall, 1979, are summarized and the transition dynamics of the shift from algal to bacterial dominance of nitrogen pathways are further defined. Experiments are reported which represent quite different approaches to winter pond management--toxic inhibition versus biofilter and hydroponic purification. Detailed evaluations of management strategies are presented including a basic siphon strategy, a new bucket detritus removal strategy, and the first attempts at total nitrogen budgeting and assessment of bacterial interactions. An economic model of fish culture in solar-algae ponds is described.