Experimental and statistical investigations of the global chemical composition of six trawling fish of the Gulf of Gabès (Mediterranean Sea)

Koubaa, Aida; Abdelmouleh, Makki; Bouaïn, Abderrahmen; Mihoubi, Nourhène Boudhrioua

doi:10.1017/s0025315410000640

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…According to Koubaa et al 12 and Huynh and Kitts 11 , fish are classified as fatty (>10% fat), medium fat (5-10% fat), low fat (<5% fat) or lean (<2%) according to the percentage fat in the muscle. With a total lipid content of 4.0±1.16% for raw Cape snoek and 4.3±1.01% for cooked snoek muscle (skin removed), Cape snoek may be classified as a lowfat fish.…”

Section: Discussionmentioning

confidence: 99%

“…9,10 Fish are classified as either fatty (>10% fat), medium fat (5-10% fat), low fat (2-4% fat) or lean (<2% fat) according to the percentage fat in the muscle. 11,12 In general, marine fish species are high in n-3 PUFAs, particularly eicosapentaenoic acid (ECP, C20:5n-3) and docosahexaenoic acid (DHA, C22:6n-3), as well as in monoenes such as C18:1n-9, and the saturated fatty acid C16:0 (palmitic acid). The fatty acid profile of marine fish is dependent on their type of diet.…”

Section: Introductionmentioning

confidence: 99%

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Proximate and fatty acid composition of cooked South African Cape snoek (Thyrsites atun)

Henning¹,

Hoffman²

2017

S. Afr. J. Sci.

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Cape snoek (Thyrsites atun) is an important source of protein for people in South Africa; however, nutritional information thereof is limited. The proximate and fatty acid compositions of raw and cooked (80 °C) snoek muscles were determined according to official AOAC methods. The mean moisture, ash, total lipids and protein for raw snoek were 72.8±1.86%, 1.3±0.09%, 4.0±1.16 and 21.5±1.35%, respectively. Cape snoek is very high in palmitic acid (24.65±1.43%), oleic acid (18.21±2.64%), eicosapentaenoic acid (EPA, 9.11±2.06%) and docosahexaenoic acid (DHA, 19.70±3.25%). With the exception of total lipids, cooking significantly reduced moisture (69.40±2.03%) and ash (1.12±0.12%), and increased protein (24.47±1.39%) content. It is concluded that Cape snoek is very high in protein and can be classified as a low-fat fish which is rich in EPA and DHA.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Proximate and fatty acid composition of cooked South African Cape snoek (Thyrsites atun)

Henning¹,

Hoffman²

2017

S. Afr. J. Sci.

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Fillet proximate composition, lipid quality, yields, and organoleptic quality of Mediterranean-farmed marine fish: A review with emphasis on new species

Grigorakis

2015

Critical Reviews in Food Science and Nutrition

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Species diversification in Mediterranean mariculture involves various important fish that contribute to the diet of many human populations. These include meagres (Sciaenidae), flatfishes, mullets, and various sparids. Their quality aspects (yields, fillet proximate composition, and lipid quality) are discussed in this review. Their filleting yield is mostly 40-45%. The viscerosomatic index ranges from 1.5% to 14%, depending on species. Low muscle fat contents of flatfishes and meagres differentiate them from the rest of the farmed species. Farmed fish contain high n-3 polyunsaturates fatty acids (PUFA; 12.3-36.3% vs. 5.48-37.2% in the wild) and have higher muscle fat and n-6 PUFA contents (mainly 18:2 n-6) than their wild counterparts. The aquaculture management, diet, and season can affect fillet composition and fatty acids, while season (i.e. food availability and maturation) largely affects lipid quality in wild fish. Data on the sensory quality of Mediterranean-farmed species are mainly limited to whether specific management differentiates the sensory quality; thus, further development of tools for sensory analysis is required. Observations on the quality features in farmed Mediterranean fish indicate that species diversification can also provide product diversification based on different commercial weights and fillet quality specifications.

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Classification of Kudoa thyrsites infected and uninfected fish using a handheld near‐infrared spectrophotometer, SIMCA and PLS‐DA

Henning

2024

Journal of Fish Diseases

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Kudoa thyrsites infection of marine fish typically results in myoliquefaction, which is only apparent 24 to 56 h post‐mortem. The traditional methods for the detection of K. thyrsites infected fish are time‐consuming and destructive, reducing its marketability. This poses a challenge for the fish industry to remove infected fish before it reaches the market or further processing activities. This study investigated the use of near‐infrared (NIR) spectroscopy, in combination with soft independent modelling of class analogy (SIMCA) and partial least square discriminant analysis (PLS‐DA), for discriminating K. thyrsites infected fish from uninfected fish. Performance of the classification models was evaluated by calculating the sensitivity, specificity and precision. A total of 334 fish samples (200 sardine, 64 hake and 70 kingklip) were used for this study. Infection of K. thyrsites was determined with the use of qPCR assays. Ninety per cent (90%) of the sardine samples, 78% of the hake samples and 37% of the kingklip samples were infected. Class groups of infected and uninfected fish samples were created for the purpose of generating SIMCA and PLS‐DA classification models for each species of fish, as well as for a species independent data set. Principal component analysis (PCA) of NIR spectra did not show any clustering for infected and uninfected samples. Calibration and test sample sets were generated for the purpose of building and testing the SIMCA and PLD‐DA classification models. SIMCA and PLS‐DA were unable to classify test samples correctly into the two classes. The number of misclassifications (NMC) was higher for the SIMCA models than for the PLS‐DA models, with more than 60% incorrectly classified. SIMCA classified most of the test samples into both classes. The precision for PLS‐DA were 89% for sardine, 81% for hake, 0% for kingklip and 87% for species independent models, however, most samples were classified at infected. The use of NIR spectroscopy and classification models such as SIMCA and PLS‐DA showed limited use as a method to distinguish between K. thyrsites infected and uninfected fish samples. Textural and chemical changes during extended frozen storage of the fish samples may have masked the effects associated with K. thyrsites infection. Further studies are suggested where NIR spectroscopy is used in combination with texture analysis and image spectroscopy.

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Experimental and statistical investigations of the global chemical composition of six trawling fish of the Gulf of Gabès (Mediterranean Sea)

Cited by 3 publications

References 24 publications

Proximate and fatty acid composition of cooked South African Cape snoek (Thyrsites atun)

Proximate and fatty acid composition of cooked South African Cape snoek (Thyrsites atun)

Fillet proximate composition, lipid quality, yields, and organoleptic quality of Mediterranean-farmed marine fish: A review with emphasis on new species

Classification of Kudoa thyrsites infected and uninfected fish using a handheld near‐infrared spectrophotometer, SIMCA and PLS‐DA

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