Suitability of instrumental analysis for the discrimination between wild-caught and conventionally and organically farmed shrimps

An enlarged range of scallop products on the market allows the consumer to buy lower priced alternatives, which often raises the question of quality and control. Frozen meat of king scallops (Pecten maximus) and Atlantic sea scallops (Placopecten magellanicus) were purchased on the German market and compared with fresh shell-on king scallops of various origin. The approximate composition, inclusive citric acid and phosphates, minerals, free amino acids (FAA) and fatty acid profiles were examined in the muscle to identify changes as a result of processing. The FAA glycine and taurine as well the fatty acids 20:5n-3 (EPA) and 22:6n-3 (DHA) were the most abundant, but were reduced in processed samples. Di- and triphosphate contents were not detectable (<0.01 g·kg−1) in untreated meats. Most frozen scallop products contained added citrates and polyphosphates and had distinctly higher water contents (up to 89%) and an increased moisture to protein ratio (M/P) (up to 9) compared with the fresh king scallops (78%, M/P < 5). Labelling of species, verified by PCR-based DNA analysis, and ingredients were not correct in each case. Overall results indicated no relevant differences in mineral content, except high sodium contents, resulting from additives. Labelling does not readily allow the consumer to recognize the extent of processing effects.

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“…Fatty acids in the range of 14:0–22:6 n-3 were estimated and represented as a percentage of all measured fatty acids. [26]. …”

Section: Methodsmentioning

confidence: 99%

Meat Composition and Quality Assessment of King Scallops (Pecten maximus) and Frozen Atlantic Sea Scallops (Placopecten magellanicus) on a Retail Level

Manthey-Karl

Lehmann

Ostermeyer

et al. 2015

Foods

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“…As a result, the farmed shrimp usually have lower variability in isotopic values than do the wild caught (Gamboa‐Delgado et al., ). Organic shrimp farming has developed rapidly in recent decades (Ostermeyer et al., ). The EU guidelines for organic farming encourage shrimp be fed with feed naturally available in ponds and lakes and if natural feed resources are not sufficient, organic feed of plant origin can be used with documentary evidence (EC, ).…”

Section: Discussionmentioning

confidence: 99%

“…And Ostermeyer et al. demonstrated that using the combination of C and N isotopes, the organically and conventionally farmed L. vannamei could be differentiated (Ostermeyer et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…In exploratory investigations, stable isotope analysis was successfully used in authentication of fishery and aquaculture products. For instance, carbon and nitrogen stable isotopes were used to differentiate the wild and farmed gilthead sea bream ( Sparus aurata ) and salmon, Pacific white shrimp ( Litopenaeus vannamei ) from industrial fishing, conventionally or organically farming, croaker from different geographic origins ( Micropogonias furnieri ) (Anderson, Hobbie & Smith, ; Chaguri et al., ; Gamboa‐Delgado et al., ; Ostermeyer, Molkentin, Lehmann, Rehbein & Walte, ; Serrano, Blanes & Orero, ). The method was also used to distinguish different aquaculture species and to help to elucidate the origin and spread of exotic invasive salmonids in Chile (Schröder & Leaniz, ).…”

Section: Introductionmentioning

confidence: 99%

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Investigation of geographic origin, salinity and feed on stable isotope profile of Pacific white shrimp (Litopenaeus vannamei )

Ren

Dong

et al. 2017

Aquac Res

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Increasing numbers of mislabelled seafood products in the globalized market underline the need for approaches to identify the origin of these products. Pacific white shrimp cultured in different salinities (Litopenaeus vannamei) from 16 locations in China and USA were collected and differentiated based on d 13 C and d 15 N values. The d 13 C and d 15 N values of 16 commercial feeds used in shrimp culture were measured and effects of feed on C and N stable isotope composition in shrimp were investigated. Carbon and nitrogen isotopic analysis of the shrimp did not provide means to discriminate farmed shrimp from China and USA. However, the shrimp cultured in water with high salinity were enriched in 13 C compared to shrimp cultured in freshwater and this provided another basis for discrimination. The correlation between d 13 C in feed and shrimp was not significant, while the d 15 N in feed and shrimp showed a trend of positive correlation.

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“…If the genotypes of the farmed parents are known, or if the animals within the farm are genetically distinct from animals in the wild, then it is fairly simple to match genotypes of offspring back to the parents, but it becomes increasingly complex in species with many possible parents, such as fish in a hatchery . When the broodstock (parents) are not known (e.g., farmed in a foreign country and imported) or individuals are taken from the wild and raised to market size , genetics can attempt to answer the question at hand, but often additional lines of evidence are needed from nongenetic analyses such as stable isotopes , lipid chemistry to reveal components of a captive diet , and/or drug chemistry to reveal antibiotics and fungicides used in high‐intensity farming .…”

Section: Methods and Applicationsmentioning

confidence: 99%

Humans Are Animals, Too: Critical Commonalities and Differences Between Human and Wildlife Forensic Genetics

Moore

Frazier

2019

Journal of Forensic Sciences

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Wildlife forensics has recently been recognized among the wide variety of forensic science disciplines. This review compares human and wildlife DNA forensics, which use the same genetic tools, but often for far different purposes. Human forensic genetics almost invariably attempts to identify individual perpetrators involved in a given crime. Wildlife forensics often determines whether a crime has occurred. In addition to techniques familiar in human laboratories, like individual matching with STRs, wildlife analysts may be asked to determine the taxonomic identity, geographic source, or sex of evidence items, or the familial relationships or minimum number of individuals among a group of samples. This review highlights the common questions, legal framework, databases, and similar validation requirements to foster understanding between disciplines. Based on this understanding, human and wildlife DNA practitioners may work together and learn from each other in order to elevate the discipline of forensic genetics.

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Suitability of instrumental analysis for the discrimination between wild-caught and conventionally and organically farmed shrimps

Cited by 16 publications

References 23 publications

Meat Composition and Quality Assessment of King Scallops (Pecten maximus) and Frozen Atlantic Sea Scallops (Placopecten magellanicus) on a Retail Level

Meat Composition and Quality Assessment of King Scallops (Pecten maximus) and Frozen Atlantic Sea Scallops (Placopecten magellanicus) on a Retail Level

Investigation of geographic origin, salinity and feed on stable isotope profile of Pacific white shrimp (Litopenaeus vannamei )

Humans Are Animals, Too: Critical Commonalities and Differences Between Human and Wildlife Forensic Genetics

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