Okpala Charles Odilichukwu R, Bono Gioacchino
School of Science, Monash University, 46150, Bandar Sunway, Selangor DE, Malaysia.
Department of Chemical and Environmental Engineering, Masdar Institute, PO Box 54224, Abu Dhabi, United Arab Emirates.
J Sci Food Agric. 2016 Mar 15;96(4):1231-40. doi: 10.1002/jsfa.7211. Epub 2015 May 11.
The practicality of biometrics of seafood cannot be overemphasized, particularly for competent authorities of the shrimp industry. However, there is a paucity of relevant literature on the relationship between biometric and physicochemical indices of freshly harvested shrimp. This work therefore investigated the relationship between biometric (standard length (SL), total weight (TW) and condition factor (CF)) and physicochemical (moisture content, pH, titratable acidity, water activity, water retention index, colour values and fracturability) characteristics of freshly harvested Pacific white shrimp (Litopenaeus vannamei) obtained from three different farms. The relationships between these parameters were determined using correlation and regression analyses.
No significant correlation (P > 0.05) was found between the biometric and physicochemical indices of the sampled L. vannamei specimens. Possibly the lack of post-mortem and physical change(s) at day of harvest together with the absence of temporal variable may have collectively limited the degree of any significant correlation between biometric and physicochemical data points measured in this study. Although the TWs of freshly harvested L. vannamei shrimp resembled (P > 0.05), SL and CF differed significantly (P < 0.05) with minimal explained variance. Moreover, some biometric and physicochemical variables were independently correlated (P < 0.05).
Data indicated that no significant correlation existed between biometric and physicochemical characteristics of freshly harvested L. vannamei shrimp. Across the farms studied, however, the biometric data were comparable. To best knowledge, this is the first study to investigate the biometric and physicochemical properties of freshly harvested shrimp using a comparative approach, which is also applicable to other economically important aquaculture species. Overall, this work provides useful information for competent authorities/stakeholders of the fishery industry and serves as a baseline for preservative treatments.
海鲜生物特征识别的实用性再怎么强调都不为过，特别是对于虾类产业的主管部门而言。然而，关于刚捕捞的虾类生物特征与理化指标之间关系的相关文献却很匮乏。因此，本研究调查了从三个不同养殖场获取的刚捕捞的太平洋白虾（凡纳滨对虾）的生物特征（标准长度（SL）、总重量（TW）和条件因子（CF））与理化特征（水分含量、pH值、可滴定酸度、水分活度、保水指数、颜色值和易碎性）之间的关系。通过相关性和回归分析确定了这些参数之间的关系。
在所采样的凡纳滨对虾样本中，未发现生物特征与理化指标之间存在显著相关性（P>0.05）。可能是收获当天缺乏死后变化和物理变化，再加上没有时间变量，共同限制了本研究中所测量的生物特征与理化数据点之间显著相关性的程度。虽然刚捕捞的凡纳滨对虾的总重量相似（P>0.05），但标准长度和条件因子差异显著（P<0.05），且解释方差最小。此外，一些生物特征和理化变量存在独立相关性（P<0.05）。
数据表明，刚捕捞的凡纳滨对虾的生物特征与理化特征之间不存在显著相关性。然而，在所研究的各个养殖场中，生物特征数据具有可比性。据我们所知，这是第一项使用比较方法研究刚捕捞的虾类生物特征和理化特性的研究，该方法也适用于其他具有重要经济价值的水产养殖物种。总体而言，这项工作为渔业主管部门/利益相关者提供了有用信息，并为防腐处理提供了基线。
