Impact of production chain on defects of farmed shrimp (Penaeus vannamei)

ABSTRACT: The production chain of Penaeus vannamei require detailed quality evaluation from farm to processing plant, to maintain the quality standards. We evaluated the impact of production chain steps in main defects of P. vannamei as red hepatopancreas, detached cephalothorax and post-mult. Red hepatopancreas and detached cephalothorax exhibited the highest defect incidence, which are related to capture method and post-harvest handling procedures. Red hepatopancreas showed a positive correlation (r = 0.56; P = 0.008) with post-molts. The Principal Component Analysis (PCA) explained 53.91% of total data variance, where the second principal component (PC2) contributed with 19.39% separating shrimp defects and management steps based on square cosines of red hepatopancreas and transport time. These results suggested that steps of production chain as well as post mortem process are directly related to shrimp defects, and the knowledge of these factors can contribute to improve the product quality.

摘要：凡纳滨对虾（Penaeus vannamei）的生产链需从养殖场至加工厂开展全流程精细化品质管控，以维持既定质量标准。本研究评估了生产链各环节对凡纳滨对虾三类主要缺陷——红肝胰腺（red hepatopancreas）、头胸甲脱落（detached cephalothorax）及蜕后（post-mult，原文疑似笔误，应为post-molt）的影响。其中红肝胰腺缺陷与头胸甲脱落的发生率最高，二者与捕捞方式及采后处理流程密切相关。红肝胰腺缺陷与蜕后个体呈显著正相关（相关系数r=0.56；显著性P=0.008）。主成分分析（Principal Component Analysis，PCA）可解释总数据方差的53.91%，其中第二主成分（PC2）的贡献占比为19.39%，可基于红肝胰腺与运输时长的平方余弦值区分对虾缺陷类型与生产管理环节。本研究结果表明，生产链各环节及死后处理工序均与对虾缺陷直接相关，明晰这些影响因素有助于提升产品品质。