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Latin american journal of aquatic research

versión On-line ISSN 0718-560X

Lat. Am. J. Aquat. Res. vol.47 no.5 Valparaíso nov. 2019

http://dx.doi.org/10.3856/vol47-issue5-fulltext-13 

Short Communication

Analysis of the chemical composition of the lionfish Pterois volitans as a food strategy for its control

María Isabel Castro-González1 

José Adán Caballero-Vázquez2 

Fernando M. Guerra-Infante3 

Marcela López-Hurtado3 

1Dirección de Nutrición, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Tlalpan, Ciudad de México, México

2Centro de Investigación Científica de Yucatán, Unidad de Ciencias del Agua, Laboratorio de Ecología y Biodiversidad de Organismos Acuáticos, Cancún, Quintana Roo, México

3Laboratorio de Inmunobiología Celular y Molecular, Instituto Nacional de Perinatología Ciudad de México, México

ABSTRACT

The lionfish is the first invasive species that came to the western Atlantic region to establish itself as an ecological and economic threat to coral ecosystems and commercially important consumption species. Fifteen specimens were collected in Quintana Roo, Mexico, to analyze the chemical composition of the lionfish (Pterois volitans) as a strategy to promote its consumption by the population. They were gutted, filleted, homogenized and chemically analyzed. The analyzed LF had an energetic protein content of 103.89 kcal 100 g-1 of the fillet (20.19%) and a fat percentage of 2.56%. The content of P, Ca, Na, K and Mg were 174.15, 26.09, 81.47, 339.73 and 30.27 mg 100 g-1, respectively. The most abundant essential amino acid was lysine (12.98 g 100 g-1 protein). The present work is important because it reports that the LF could be used as food with the right quantity and quality of protein, and its consumption would diminish its environmental impact.

Keywords: Pterois volitans; red lionfish; invading species; chemical composition; aquaculture

In 2002, the National Oceanic and Atmospheric Administration (NOAA) informed on the successful invasion of Pterois volitans (Linnaeus, 1758) and Pterois miles (Bennet, 1828) in the USA Atlantic coastal waters. These species belong to the family Scorpaenidae, known as lionfish, scorpionfish, red firefish, red lionfish or turkey fish (Barriche et al., 2013; Tsiamis et al., 2015). They are native to the Indo-Pacific Ocean seas, from Japan to New Zealand, and all austral islands from Indonesia, Micronesia and French Polynesia until Sumatra (Barriche et al., 2013). Currently, its presence is considered as one of the major ecological disasters of the last 20 years due to the negative ecological and economic impact it is causing. Until now, it has no predators. It is a carnivorous fish, feeding on more than 60 fish species (of both commercial and ecological relevance), crustaceans and mollusks on the sites where it has successfully established (Whitfield et al., 2002; Morris & Akins, 2009; Schofield, 2010).

Its reproductive success and adaptation to different habitats of the Caribbean has been such that in less than 30 years it has expanded dramatically its distribution, which goes from New York to Bermuda's, the Gulf of Mexico and the Caribbean, and the coasts of Guatemala, Venezuela and Brazil (Ferreira et al., 2015; Arredondo-Chávez et al., 2016).

Among the strategies for Pterois volitans lionfish (LF) control, there is consumption. Different biotic and abiotic factors determine the fatty acid (FA) composition in fish tissues and organs. This information is useful for humans because fish consumption is associated with health benefits. The lionfish is a mild-tasting fish, and its edible portion has the appearance of white and lean fish. Its taste is milder than that of jurel, bonito or lebranche mullet, similar to the northern red snapper (Hernández-Matus & Caballero-Vázquez, 2015). However, its consumption has been controversial because it is considered a potential health hazard, due to the presence of a toxin known as ciguatera. A scientific study demonstrated that its consumption does not pose any health risk because the toxin is deactivated by cooking the fish (Wilcox & Hixon, 2015). The LF poison is a protein toxin that becomes inactivated 30 min after the fish dies, and is located in the spines (not in the edible portion). With good filleting, it does not pose any risk as long as it is well-cooked (Wilcox & Hixon, 2015). Because the muscle represents the most important edible portion of fish, the objective of this paper was to analyze the chemical composition of the LF muscle as part of one of the strategies to stimulate its consumption.

Fifteen LF specimens were captured with Hawaiian spears in the region of Akumal in Quintana Roo, Mexico (20°25'00”N, 87°18'00”W), during the summer of 2015. Specimens were transported to the Centro de Investigación Científica de Yucatán A.C. (CICY) laboratory. The average standard length of the fish was 19.19 cm with a weight of 231.31 g.

Once in the CICY laboratory, fishes were gutted, filleted, separating from the edible portion (fillets), the internal spines, and those of the fins, including the skin. Fillets were frozen and transported to the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán in Mexico City, where they were thawed, ground and homogenized to obtain randomly 300 g of sample to perform the chemical analyses in triplicate. Samples were previously supplemented with 0.1% BHT (Butil-hydroxytoluene (Santa Cruz Biotechnology, Inc. Dallas, Texas, USA), as an antioxidant.

Analyses of protein, ashes, moisture and ether extract were performed according to the Official Methods of Analysis, Association of Official Analytical Chemists International (AOAC, 2005). For protein (Auto digester FOSS TECATOR™, model auto 20. Distiller Kjeltec FOSS™, model 8400), method 988.05 was used; for moisture (Drying stove Ríos Rocha™, model HS-41), 934.01 method; for ashes (Muffle Thermolyne™, model FA 1740), 942.05 m the energetic value was calculated according to the guidelines of the User's Manual of the Parr Calorimetric apparatus. All samples were analyzed in duplicate. Phosphorus (P) content was determined with method N968.08(b) (AOAC, 2005), in a Beckman, Mod. Du70, spectrophotometer. Content of Na, Ca, K and Mg were determined, after digestion, in a microwave system with a Perkin Elmer/Anton-Parr Multiwave 3000 oven, and analyzed with atomic absorbance spectrophotometry in a Perkin Elmer, model Analyst 800 apparatus, according to methods 976.25 and 965.17 (AOAC 2005). Analyses were made in duplicate. Amino acids were identified and quantified in an HPLC equipment (Amino acid analyzer Sýkam™, model S4300, S2100, S5200 and S7130. Waters Empower 3), method 994.12 (AOAC). Ether extraction was performed in Extractor Soxtec equipment FOSS™, model 2050.

Table 1 depicts the proximal composition of the LF. The chemical analysis indicated content (%) of moisture, ashes, and fats of 76.18, 1.07, 20.19 and 2.56%, respectively. Neither carbohydrates nor crude fiber was detected. The energetic value was of 103.9 kcal 100 g-1 of the fillet. Inorganic elements found (mg 100 g-1 sample) were phosphorus (P), 174.15; calcium (Ca), 26.09; sodium (Na), 81.47; potassium (K), 339.73; and magnesium (Mg), 30.27.

Table 1 Chemical composition and inorganic elements of the fillet of the Caribbean lionfish Pterois volitans. 

Chemical composition g 100 g-1 sample
Moisture 76.18 ± 003
Ashes 1.07 ± 005
Protein 20.19 ± 010
Ether extract (fat) 2.56 ± 012
Energetic content kcal 100 g-1 sample 103.89 ± 0.15
Energetic content kj 100-1 g sample 434.25 ± 061
Inorganic elements mg 100 g-1 sample
Phosphorus (P) 174.15
Calcium (Ca) 26.09
Sodium (Na) 81.47
Potassium (K) 339.73
Magnesium (Mg) 30.27

Table 2 depicts the amino acids profile, divided in essential, non-essential and conditionally essential amino acids measured in grams per each 100 g of protein. The most abundant essential amino acid was lysine (12.98), followed by leucine (8.60), valine (4.57), threonine (4.42), isoleucine (4.28), phenylalanine (4.11), methionine (2.71), histidine (2.32) and tryptophan (0.98). Regarding non-essential amino acids, the most abundant were glutamic acid (18.14), followed by aspartic acid (9.39), alanine (4.17) and serine (3.43). Lastly, regarding conditionally essential amino acids, the most abundant was arginine (7.11), followed by glycine (4.53), proline (3.60), tyrosine (3.24) and cysteine (0.94).

Table 2 Amino acids in the fillet of the Caribbean lionfish. 

Essential g 100 g-1 of fillet
Histidine 2
Isoleucine 4
Leucine 8
Lysine 1
Methionine 2
Phenylalanine 4
Threonine 4
Tryptophan 0
Valine 4
Non-essential
Alanine 4
Aspartic acid 9
Serine 3
Glutamic acid 18
Conditionally essential
Glycine 4
Proline 3
Cysteine 0
Tyrosine 3
Arginine 7

Scarce information has been published until now on the chemical composition of the LF. Hoo et al. (2013) reported the content of minerals and heavy metals of fishes caught in Jamaica and Morris et al. (2011) reported the content of some fatty acids. The present study informs on the content of nutrients in the fillet of LF caught in the Mexican Caribbean as a first approach to its relevance as food.

We found that the protein concentration (20.19%) in 100 g of fillet provides from 36 to 44% of the daily requirements of this nutrient for adult men and women, and lies within the nutritional interval (0.2 to 25%) referred for fish (Huss, 1995). The moisture content (%) was similar to that reported by Castro et al. (2007) in 16 species of Mexican marine fish (from 75.5 to 79.8%), and high when compared to commercially relevant species of Venezuela, like the tambaqui (70.73%), lisa (71.09%) and tilapia (72.36%) (Izquierdo et al., 1999), and it is within the average interval for fish, according to Huss (1995), which is from 66 to 81%.

Regarding the protein concentration in 100 g of lionfish fillet, it is higher than that of scorpionfish fish muscle (15.91%) (Scorpaena plumieri), which is a species that belongs to the same taxonomic family as the lionfish (Kaya & Kocatepe, 2014). Also, the ash content is similar in both fishes, whereas the energetic content was higher in the LF than in scorpionfish (103.89 and 67.63 kcal 100 g-1, respectively).

Fat is the nutrient with the highest variation due to biological factors like the physiological status, age, zone and time of capture, mainly (Huss, 1995; Castro et al., 2015). The LF depicts a fat content of 2.56% (Table 1) similar to that found by Kaya & Kocatepe (2014) in scorpionfish (0.20%). The LF can be considered a fish of low-fat content (2-4% of fat) (Castro et al., 2007).

The phosphorus content (174.15 mg) was higher in the LF as compared to scorpionfish (33.28 mg) (Kaya & Kocatepe, 2014) and similar to the Mexican fishes: Caranx hippos (crevalle jack, jurel) and Sciaenops ocellatus (red drum, corvina) (Castro et al., 2015). According to Huss (1999), the P interval in fish ranges from 68 to 550 mg 100 g-1; thus, consumption of 100 g of fillet would supply 13.7% of the daily requirements (1.250 mg P d-1) of this mineral in the human diet (U.S. DHHS & USDA, 2015).

The calcium content (26.09 mg) was low as reported by Hoo et al. (2013) and compared to the scorpionfish that shows 230 on 5 mg in average (Kaya & Kocatepe, 2014). Hence, this amount of calcium only contributes 2% to the daily requirements of men and women, according to the Dietary Guidelines for Americans 2015-2020 (U.S. DHHS & USDA, 2015).

Other important components of the diet are sodium (Na) and potassium (K). Fish can have sodium intervals between 30 and 134 mg 100 g-1 (Huss, 1999); in the LF, an average of 80 mg was found, a concentration that is lower when compared to the scorpionfish with an average of 135 mg (Kaya & Kocatepe, 2014). For K, the concentration intervals range from 19 to 502 mg 100 g-1. The LF showed considerable values of this mineral that were similar to those reported for the scorpionfish at relative levels of 350 mg (Hoo et al., 2013; Kaya & Kocatepe, 2014). For Mg, the reported intervals are between 4.5 and 452 mg 100 g-1. The concentration in the LF is similar to that of the scorpionfish (34.62 mg 100 g-1) (Hoo et al., 2013; Kaya & Kocatepe, 2014). Therefore, the consumption of 100 g of LF muscle will supply 8.4% of the daily Mg requirements for adult men and women (U.S. DHHS & USDA, 2015). Present work is the first study on the chemical composition and nutrient values in the LF of the Caribbean (western Atlantic). The levels obtained for these nutrients indicate that the LF has enough nutrients to be integrated into the human diet, containing significant amounts of all essential amino acids, mainly lysine. Frequent catching and consumption of the LF will allow controlling this invading species of the Mexican Caribbean, and bring about an economic improvement of the local communities that promote the consumption of this fish.

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Recibido: 06 de Noviembre de 2018; Aprobado: 08 de Junio de 2019

Corresponding author: José Adán Caballero-Vázquez (adan07@gmail.com)

Corresponding editor: Patricio Dantagnan

Creative Commons License This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.