Jellyfish biochemical composition: importance of standardised sample processing

Kogovšek, Tjaša; Tinta, Tinkara; Klun, Katja; Malej, Alenka

doi:10.3354/meps10959

Cited by 45 publications

(35 citation statements)

References 69 publications

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“…Ash content is a measure of the amount of inorganic minerals present in the sample and is generally between 3.0 and 7.8% of the dry biomass in different rotifer species (Watanabe, Kitajima, & Fujita, 1983;Jeeja, Joseph, & Malej, 2011); however, in our samples of P. similis, the ash contents were between 23.8 and 46.85% DB, which contrast with the values reported for other species of rotifers, but are very similar to those reported for gelatinous species (>50% DB) (Clarke, Holms, & Gore, 1992;Kiørboe, 2013), probably because of the close relationship of the family Proalidae with other gelatinous organism or jelly plankton as stated by Dumont (2007). Hirst andLucas (1998), andKogovsek, Tinta, Klum, andMalej (2014), mentioned that it is common that gelatinous species show an increase in dry biomass and ash content with increasing salinity. This may have important nutritional implications if P. similis is used for larval feeding, since it has been reported that gelatinous species have low nutritional quality (Doyle, Houghton, McDevitt, Davenport, & Hays, 2007); however, this aspect requires further investigation in the different strains of P. similis from different geographical regions.…”

Section: Discussioncontrasting

confidence: 54%

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Reyes¹,

Monteon²,

Urreta³

et al. 2017

Turk. J. Fish. Aquat. Sci.

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The effect of different salinities on growth, crude protein and total energy on a Mexican strain of the minute rotifer Proales similis (GenBank KM078762) were evaluated. The experiment was conducted at 5, 15, 25 and 35 psu, with five replicates. Rotifers were fed twice a day with Nannochloropsis sp., temperature, dissolved oxygen and pH values were maintained at 25±1°C, 5±1 mg L -1 and 8±1 respectively. Results show that salinity does not affect the intrinsic rate of population growth (r=0.46 to 0.51 day -1 ) and duplication time (Dt=1.36 to 1.51 days) for P. similis. Maximum density (Dmax) values were lower at 35 psu (1,703 rotifers ml -1 ), whereas Dmax values were between 2,488 to 2,560 rotifers ml -1 at 5, 15 and 25 psu. Crude protein fluctuated between 25.3 and 42.8% dry biomass (DB), while energy content varied between 11.8 and 19.9 J mg -1 DB; values were significantly lower at 35 psu. Observed population growth parameters and the protein and energy content between 5-25 psu, indicate that P. similis can be successfully reared below 35 psu, making P. similis very suitable when fish larvae require a small rotifer due to sizing of mouth gap at the beginning of exogenous feeding.

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Section: Discussioncontrasting

confidence: 54%

Untitled

Reyes¹,

Monteon²,

Urreta³

et al. 2017

Turk. J. Fish. Aquat. Sci.

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“…The time framework of dietary composition provided by stomach content analysis has been extended by combining or replacing this approach with stable isotope analysis (SIA;Brodeur et al 2008, Shoji et al 2009, Nagata et al 2015. Although sample processing protocols have been refined (Fleming et al 2011, D'Ambra et al 2014, Kogovšek et al 2014, the interpretation of stable isotope values in jellyfish is challenged by the unusual diet-tissue discrimination factors (DTDFs) from scyphomedusae to their prey. The DTDFs of a large variety of invertebrates and fish fall within the range 1.4 ± 1 ‰ (mean ± SD) for carbon (C) and 3 ± 1 ‰ for nitrogen (N) (McCutchan et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Dietary overlap between jellyfish and forage fish in the northern Gulf of Mexico

D’Ambra¹,

Graham²,

Carmichael³

et al. 2018

Mar. Ecol. Prog. Ser.

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Despite the speculations that jellyfish (hydromedusae, siphonophores, scyphomedusae and ctenophores) may compete with forage fish for prey, there are few direct comparisons of their diets. To determine the dietary overlap between Aurelia sp. (Cnidaria, Scyphozoa) and Brevoortia patronus (Goode, 1878) (Pisces, Clupeidae) in the northern Gulf of Mexico, we collected monthly samples in Louisiana, Mississippi and Alabama coastal waters (USA) during summer and early fall 2009−2010. We determined carbon and nitrogen stable isotope ratios in predators and their potential prey, including small plankton (< 200 µm) and mesozooplankton (200− 2000 µm), and identified prey in the stomachs of adult Aurelia sp. and B. patronus. Trophic niche overlap was defined using the stable isotope Bayesian ellipses in R (SIBER) procedure and ranged from 0−28% for Aurelia sp. and 0−64% for B. patronus across the 3 sites. While stable isotope values in B. patronus clearly reflected the range of mesozooplankton, those for Aurelia sp. indicated a high individual variability, which likely accounted for the niche separation in Louisiana. Copepods were numerically the most abundant prey in the stomachs of predators at all sites, resulting in a percent similarity index of 93% in Louisiana, 87% in Mississippi and 86% in Alabama. Our results highlight that, despite local and species-specific variability, dietary overlap between Aurelia sp. and B. patronus is high across the northern Gulf of Mexico. Our data contribute to the definition of trophic interactions between jellyfish and forage fish in the Gulf of Mexico region and other ecosystems where they co-occur.

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“…(Kogovšek et al . ) compared several methods used for the study of jellyfish biochemical composition and established that during drying in the oven at 60C, the content of C, N and the total content of amino acids in the jellyfish tissue decreases 10 times as compared with cool dehumidification.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Different Drying Modes of Scyphozoan Jellyfish Rhopilema Esculentum and Aurelia Aurita on the Protein and Carbohydrate Components in their Composition and the Possibility of Their Use as Dried Prepared Food

Yuferova

2015

J Food Process Engineering

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The article studied the impact of convection drying on the stability of proteins and sugars in jellyfish species Rhopilema esculentum and Aurelia aurita. The interdependence of the drying time and the process parameters was studied. Stability of the proteins was evaluated by their denaturation degree, using the method of Ds-Na-PAAG-electrophoresis; the stability of monosaccharides was evaluated with regard to change in their composition using the Gas Liquid Chromatography method. Fixation of the dried jellyfish structure after hydration was performed by reducing the pH of the solution by adding the 70% acetic acid in quantity 0.3% into the 4% solution of salt. Acetic acid restrained the distinct smell of dried jellyfish, stabilized its structure. The dried semifinished product that has passed the hydration without adding acetic acid had an unstable, moist structure. Marinated products have gained good taste in 3 days; the smell of raw jellyfish disappeared completely after 5 days. PRACTICAL APPLICATIONSIt was found that at a drying temperature of 65C, the content of protein and carbohydrate components in Rhopilema esculentum reduced by 50% as compared with the content in the native sample, the content of amino sugars (glucosamine, galactosamine) does not change, which indicates the active ongoing reaction of melanoidin formation. The application of food production technology with the use of Rhopilema esculentum as dried prepared food along with the hydration process was substantiated. Therefore, the study justified specific drying mode for Rhopilema esculentum, which implies minimal loss of protein-carbohydrate components. The loss of proteins and sugars in the jellyfish Aurelia at a drying temperature 50C made 60%, as compared with their content in the native sample, indicating nonexpediency of further experiments. Thus, the research provided optimum parameters for drying of Rhopilema esculentum.

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Jellyfish biochemical composition: importance of standardised sample processing

Cited by 45 publications

References 69 publications

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Dietary overlap between jellyfish and forage fish in the northern Gulf of Mexico

The Impact of Different Drying Modes of Scyphozoan Jellyfish Rhopilema Esculentum and Aurelia Aurita on the Protein and Carbohydrate Components in their Composition and the Possibility of Their Use as Dried Prepared Food

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