The present study was carried out at the Thycattussery area in Vembanad lake and assessed the ichthyo-diversity, variability in climatic variables, the exploited status of predominant small-scale sector fisheries (SSFs) and impact of climatic variables upon an existing SSF. Fish, as well as clam specimens collected from the study area, were identified. Diversity indices and dominance curves helped to identify monsoon (June–September) as the diverse season in the wetland. SIMPER (similarity percentage) analysis indicated that Villorita cyprinoides (clam) was the predominant species in the wetland with a mean relative abundance of 16.1%. Canonical correspondence analysis (CCA) of variables with clam production identified calcium hardness and rainfall with axis loadings of –0.56 and 0.50 respectively as the variables predominantly contributing to clam production. Stepwise regression indicated that temperature and rainfall were the determinants of clam production. A decrease in rainfall and an increase in temperature at an annual rate of 0.02 and 0.8%, respectively, decreased the clam production by 5.37%/year in the study area. Further, the generalized linear model (GLM) indicated stagnancy in clam production until 2035 below 400,000 kg per year. The study introduced diversification of livelihood systems using clam culture in climate resilient pen structures (CRPS) as an adaptation strategy.

本研究在 Vembanad 湖的 Thycattussery 地区进行，评估了鱼的多样性、气候变量的可变性、主要小规模渔业 (SSF) 的开发状况以及气候变量对现有 SSF 的影响。确定了从研究区域收集的鱼类和蛤标本。多样性指数和优势曲线有助于将季风（6 月至 9 月）确定为湿地的多样化季节。SIMPER（相似性百分比）分析表明，鲤鱼（蛤）是湿地的主要物种，平均相对丰度为 16.1%。与蛤蜊生产变量的典型对应分析 (CCA) 将轴载荷分别为 –0.56 和 0.50 的钙硬度和降雨量确定为主要有助于蛤蜊生产的变量。逐步回归表明温度和降雨量是蛤产量的决定因素。降雨量的减少和气温的年增长率分别为 0.02% 和 0.8%，使研究区的蛤产量减少了 5.37%/年。此外，广义线性模型 (GLM) 表明，到 2035 年，蛤蜊生产停滞不前，每年低于 400,000 公斤。该研究介绍了在气候弹性围栏结构 (CRPS) 中使用蛤养殖作为适应策略的生计系统的多样化。