Trace elements in the tissues of cephalopods from the waters off Northeast Taiwan

• Main Authors: Jing-Yu Chen, 陳靜瑜
• Other Authors: Chih-Shin Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/68150074046713040313

碩士 === 國立臺灣海洋大學 === 海洋事務與資源管理研究所 === 98 === The plasticity of life history and high environmental sensitivity of cephalopods are potentially important factors to take into account in stock assessment and fishery management measures and also provide them as a biomonitor to detet the changes of environmental conditions. Cephalopods are seafood species in Taiwan. However, the relevant studies on trace element concentrations are still limited. The objectives of this study are: (1) to determine the baseline information for the concentrations of trace elements in the tissues of cephalopods from the waters off Northeast Taiwan; (2) to analyze the concentrations of trace elements in the tissues of cephalopods by species, size and month, and investigate the possible factors causes for the differences; (3) to estimate the maximum safety consumption of Cadmium (Cd) based on the criterion of Provisional Tolerable Weekly Intake for cephalopod species. Four cephalopod species (Sepia lycidas, Uroteuthis (Photololigo) edulis, Sthenoteuthis oualaniensis, and Octopus vulgaris) were collected from Ta-shi fishing port in Yi-lan County (Northeast Taiwan) in July and October 2009 and January and April 2010. Concentrations of chromium (Cr), manganese (Mn), iron (Fe), copper (Cu), zion (Zn), strontium (Sr), Cd and barium (Ba) were measured in weighted samples (around 0.5 g) of mantle, digestive gland and gonads by using an Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). The recovery rate for the certified values of standard material materials is 100 ± 11%. Concentrations of Cu, Fe, and Zn are higher than others in the four cephalopod species. The concentrations of elements are higher in digestive gland than the other tissues, particularly for Cd concentration which showed more than one order of magnitude than the other elements, reflecting the digestive gland’s role in the storage and detoxification of this element. The concentrations of elements are generally higher in cuttlefish and octopus than in squids which may be related to the differences in ambient concentrations in seawater and diets. The levels of elements decrease with increasing body size in neritic squid and octopus. This may be related to this dietary shift, or habitat change with growth. The concentrations of elements are higher in April and July for demersal species which may relate to the seasonal migration of Kuroshio around the Northeast Taiwan. The maximum safe weekly consumption of mantle of cephalopod was estimated to be 150 ~1230 g based on the suggested provisional tolerable weekly intake for Cd. The current study provides the baseline information for concentrations of trace element in various of cephalopods for public health concerns for considering Cd concentrations in seafood