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Revista de Biología Tropical

On-line version ISSN 0034-7744Print version ISSN 0034-7744

Rev. biol. trop vol.62 n.4 San José Oct./Dec. 2014

 

The effect of astaxanthin on resistance of juvenile prawns Macrobrachium nipponense (Decapoda: Palaemonidae) to physical and chemical stress

Efecto de la astaxantina en la resistencia al estrés físico y químico de los langostinos jóvenes de Macrobrachium nipponense (Decapoda: Palaemonidae)

Babak Tizkar1*, Alireza Seidavi2*, Jesús Trinidad Ponce-Palafox3* & Parastoo Pourashoori4*



Abstract

In recent years, the use of new scientific techniques has effectively improved aquaculture production processes. Astaxanthin has various properties in aquacultureand its antioxidant benefits have been closely related to stress resistance; besides, it is an essential factor for growth in many crustaceans and fish. The objective of this study was to evaluate the resistance of prawn (Macrobrachium nipponense) fed diets containing different amounts of astaxanthin (AX) to the shock and stress of differentphysicochemical environments. A 70-day trial was conducted to evaluate the effect of supplementation of a source of astaxanthin (Carophyll Pink, 10% astaxanthin, w/w, Hoffman-La Roche, Switzerland) at various levels in the diet of M. nipponense juveniles. Four dry diets were prepared: AX0 without astaxanthin, AX50 with 50mg/kg, AX100 with 100mg/kg, and AX150 with 150mg/kg astaxanthin. The feeding trial was conducted in a recirculation water system consisting of 12 fiberglass tanks (1 000L) used for holding prawns. Three replicate aquaria were initially stocked with 36org/m2 per tank. During the trial, prawns were maintained on a 12:12-h light:dark photoperiod with an ordinary incandescent lamp, and the water quality parameters were maintained as follows: water temperature, 25-26°C; salinity, 1g/L; pH, 8.5-8.8; dissolved oxygen, 6.0-6.5mg/L; and ammonia-nitrogen, 0.05mg/L. Incorporation of AX, production output, and physiological condition were recorded after 10 weeks of feeding. At the end of the growing period, the prawns were exposed to thermal shock (0°C), ammonia (0.75mg/L), and reduced oxygen (0.5mg/L). The time to lethargyand the time to complete death of the prawns were recorded. The results showed that control prawns had the shortest time to lethargy and death compared with prawns subjected to the other treatments. The results of this study have shown that the amount of muscle tissue and gill carotenoids in prawn fed with an AX150 diet showed greater reduction than those exposed to other treatments. It is possible that higher levels of astaxanthin in the body under oxygen reduction stress can be beneficial forprawns. These results suggest that male prawns showed lethargy earlier than females, and the percentage of carotenoid reduction in muscle and gill tissues was higher inmales. Rev. Biol. Trop. 62 (4): 1331-1341. Epub 2014 December 01.
 
Key words: ammonia, astaxanthin, prawn, stress, thermal.

Resumen

En años recientes, la utilización de nuevas técnicas científicas ha tenido un efecto importante en mejorar los procesos de producción en acuicultura. La astaxantina tiene varias propiedades en la acuicultura y sus propiedades antioxidantes se encuentran estrechamente relacionadas con la resistencia al estrés. La astaxantina en muchos crustáceos y peces es un factor esencial para el crecimiento. El objetivo de este estudio fue evaluar la resistencia del langostino (Macrobrachium nipponense) alimentado con dietas conteniendo diferentes cantidades de astaxantina (AX), bajo diferentes condiciones de estrés ambiental. Un ensayo de 70 días fue llevado a cabo para evaluar el efecto de la suplementación de fuentes de astaxantina (Carophyll Pink, 10 % astaxanthin) en varios niveles en la dieta de jóvenes de M. nipponense. Cuatro dietas fueron preparadas: AX0 sin astaxantina, AX50 con 50mg/kg, AX100 con 100mg/kg y AX150 con 150mg/kg de astaxantina. Los ensayos de alimentación fueron conducidos en un sistema de recirculación de agua consistente en 12 estanques de fibra de vidrio (1 000L). Tres replicas fueron sembradas con 36org/m2 por tanque. Durante el experimento los langostinos fueron mantenidos con un fotoperiodo de 12:12 luz:oscuridad con lámparas incandescentes y los parámetros de la calidad del agua fueron mantenidos a 25-26°C la temperatura, 1 g/L la salinidad, 8.5-8.8 el pH, 6.0-6.5 mg/L el oxígeno y 0.05mg/L el nitrógeno amoniacal. La incorporación de la astaxantina, producción y condiciones fisicoquímicas fueron registradas después de 10 semanas de alimentación. Al final del periodo de crecimiento, los langostinos fueron expuestos a un shock térmico (0°C), amonio (0.75mg/L) y reducción de oxígeno 0.5 mg/L. El tiempo de letargia y el tiempo de muerte fueron registrados. Se encontró que la dieta con la mayor concentración de astaxantina (150mg/kg) presentó el mayor tiempo de letargia y la mayor concentración en branquias y músculo en el langostino M. nipponense.
 
Palabras clave: amonio, astaxantina, estrés, langostino, termal.



In recent years, the use of new scientific techniques has effectively improved aquaculture production processes. Carotenoids are coloredpigments found in plant and animal products; however, only plants, some bacteria, and yeasts are able to produce carotenoids. The coloredpigments can enter (and accumulate within) the bodies of crustaceans through the food chain (Ponce-Palafox, Arredondo-Figueroa, & Vernon-Carter, 2006).

Carotenoids play very important roles in human and animal health (Yuan, Peng, Yin, & Wang, 2011). They act as potent antioxidants thatinactivate oxygen free radicals produced by normal cellular activities or free radicals released by stressors (Chew, 1995). Similar to other animals,crustaceans cannot make carotenoids, which are needed for their metabolic processes. Thus, in the natural environment, crustaceans must obtain carotenoids from their diet; similarly, in a cultured environment, carotenoids must also be added to the diet (Hornero-Mendez & Britton, 2002). Beta-carotene is known as an antioxidant for fats, and astaxanthin, which has a long chain with a double bond and unstable electron orbitals, can beused to protect against oxygen radicals within cells (Stanier, Kunizawa, & Cohen-Bazire, 1971). The antioxidant activity of astaxanthin is known to be 10 times higher than that of beta-carotene and 100 times higher than that of alpha-tocopherol (Shimidzu, Goto, & Miki, 1996). Thus, astaxanthin is sometimes referred to as “super vitamin E” (Miki, 1991).

Astaxanthin has various properties in aquaculture (Torrissen, 1990; Shimidzu et al., 1996), and its antioxidant properties are closely related tostress resistance. Resistance against salinity stress (Darachai, Piyatiratitivorakul, Kittakoop, Nitithamyong, & Menasveta, 1998; Merchie et al.,1998; Chien, Pan, & Hunter, 2003), thermal stress (Chien et al., 2003), and stress-induced oxygen reduction (evacuated oxygen) (Chien et al., 2003)are known to be conferred by astaxanthin. Torrissen and Christiansen (1995) indicated that astaxanthin in many crustaceans and fish is an essentialfactor for growth, and other carotenoids, such as canthaxanthin, beta-carotene, xanthophylls, and lutein, may also have important physiologicalfunctions in the cell.

As previously noted, some researchers believe that under conditions of oxygen deficiency, carotenoids may play an important role inrespiration of the ovule. Craik and Harvey (1984) showed that carotenoids in eggs had roles in respiration. Similarly, they found that broodstock thatwere fed diets containing carotenoids had eggs with greater amounts of carotenoids, and the state of over-maturity occurred later in this group thanin the control group. Chien, Chen, Pan, and Kurmaly (1999) found that juvenile shrimp fed a diet containing a high level of astaxanthin showed increased survival compared with control animals under oxygen depletion stress (dissolved oxygen [DO], <1mg/L for 4h). Some studies haveshown that one of the main functions of carotenoids is to counter the toxicity of ammonia and other toxic amines produced by protein metabolism(Pan, Chien, & Hunter, 2003). The highly colored eggs of Oncorhynchus kisutch are more highly resistant to the increase in ammonia compared with pale rainbow trout eggs (Yarzhombek, 1970). Studies exploring the ability of antioxidants to protect against oxidative damage can be conducted by pretreating animals with antioxidants and subjecting them to oxidative stress induced by oxidants or toxic substances (Aispuro-Hernandez et al., 2008). Pan et al. (2003) tested the antioxidant effects of astaxanthin in shrimp juveniles in terms of recovery, aspartate aminotransferase level, and alanine aminotransferase level under thermal and osmotic stress. The objective of this study was to evaluate the resistance of shrimp (Macrobrachium nipponense) that were fed diets containing different amounts of astaxanthin to different physical and chemical changes inducing stress.

Materials and methods

A 70-day trial was conducted to evaluate the effect of supplementation of a source of astaxanthin (Carophyll Pink, 10% astaxanthin, w/w, Hoffman-La Roche, Switzerland) at various levels in the diet of M. nipponense juveniles. Four dry diets were prepared: AX0 without astaxanthin,AX50 with 50mg/kg, AX100 with 100mg/kg, and AX150 with 150mg/kg astaxanthin (Table 1). The food was mixed and homogenized and subsequently converted to pellets (3mm diameter) using a California Pelleting Machine (CPM); it was steamed for 6min and dried at a temperature of 45°C for 3h. All the diets were stored at -18°C until use. Crude protein, total fat, carbohydrate, ash, and moisture were measured using the methoddescribed by Association of Analytical Chemists (AOAC, 2005) (Table 2). At the end of the growing period, three stressor experiments were performed on treatment and control shrimp and on males and females separately. The amount of total carotenoids in the gill area and trunk muscleswas measured at the beginning and end of the experiment (Chien et al., 2003).

The feeding trial was conducted in 12 fiberglass tanks (1 000L) used for holding prawns. The tanks were maintained by a continuous recirculation system (2%) via a 3/4 Hp pump (Siemens) that generated a daily turnover volume of 200%; a 1/3 Hp blower (Pioneer, RB20-510, Ling-Ya, Kaohsiung, Taiwan) aerated the water, and a sand filter provided mechanical filtration. Three replicate aquaria were initially stocked with36org/m2 per tank. During the trial, prawns were maintained on a 12:12-h light:dark photoperiod with an ordinary incandescent lamp, and the water quality parameters were maintained as follows: water temperature, 25-26°C ; salinity, 1g/L; pH, 8.5-8.8; dissolved oxygen, 6.0-6.5mg/L; andammonia-nitrogen, 0.05mg/L. To keep the prawns within nests and decrease nest cannibalism, 10 clay nests were placed in each tank.

A total of 432 freshwater shrimp (M. nipponense) from the international Anzali wetland in Iran were collected. The females and males had average individual weights of 1.17±0.20g and 2.78±0.34g, respectively. The prawns were fed the experimental diets three times daily (7:00, 13:00, and 19:00h). The feeding quantity was adjusted to 5% of their body weight per day. Feed, fecal waste, and prawn shells were removed daily through a siphon from the pond bottom.

At the end of the feeding trial, the prawns were fasted for 24h and then weighed. After weighing, most prawns in each aquarium were used for samples, dried, and homogenized for whole body composition analysis. A 10g feed sample was randomly removed from each diet and analyzed to determine its approximate composition. Moisture, crude protein, crude lipid, fiber, and ash contents of the experimental diets and prawns (triplicate samples) were determined using standard methods (AOAC, 2005). To determine the amount of total carotenoids extracted, UV-visible spectrophotometry (Hitachi, U-1800) was used with a spectral window between 380 and 750nm; triplicate samples were measured. The carotenoid concentration was obtained using the Lambert-Beer law, and for calculation purposes, the following equation was applied to the absorbance values:

Total carotenoid μg/mgh=(absorbance / € x molecular mass × 1,000 × sample volume L)/sample dry weight )mg(.

The specific optical extinction coefficient €11cm of 124,000(astaxanthin) at 460nm was used (Buchwaldt & Jencks, 1968) in conjunction with a molecular mass of 596.84 (astaxanthin). The absorbance measurements were performed in triplicate, and the values previously averaged were applied in the above equation (Schoefs, 2002).
 
Thermal shock experiments: In this experiment, 3 male and 3 female shrimp were selected from each replicate and immediately transferred in bottles of cold water to a temperature of 0°C. At the time of transfer, the water temperature was 24°C. For this purpose, 72 number one literbottles containing cold water were prepared. Each shrimp was placed separately inside a bottle. During the experimental period, the amount ofdissolved oxygen in the bottles was equal to 6.5±0.6mg/L, and the pH was 8.5±0.2. The time to lethargy and time to complete death of the shrimpwere recorded.
 
Ammonia shock experiments: In this experiment, 72 bottles of 1L capacity were prepared and filled with water. Liquid ammonia (0.75mg/L)was added to each bottle. Then, according to the previous experiment, one prawn was placed in each bottle. Time to lethargy and complete death was measured for the shrimp in each bottle. During the experimental period, the amount of dissolved oxygen in the bottles was equal to6.5±0.6mg/L, and the pH was 8.5±0.4.
 
Oxygen reduction shock experiments: In this experiment, 72 bottles of 1L capacity were prepared and filled with water from the same waterbath. Nitrogen gas was then injected into the bottles, and the dissolved oxygen in the bottles decreased to 0.5mg/L. At this time, prawns were addedto the bottle, and time to lethargy and complete death of the prawn in each bottle were measured. During the experimental period, the pH was 8.5±0.4 and the water temperature was 25.3±1.2°C.

This study was designed based on a factorial design (Montgomery, 2005). The data were verified using the Kolmogorov-Smirnov Test,normalized, and subjected to two-way ANOVA. Tukey’s test was used to compare differences between the diets. All data were examined at the 5% level, and the mean ± standard error is presented.

Results

Carotenoids in tissue: After 10 weeks of consuming diets AX50, AX100, and AX150, carotenoid levels were significantly (Tukey, p<0.05)increased in muscle and gill tissues in males and females compared to carotenoid levels in animals that consumed the control diet. The averageincreases in male and female muscle tissues were 89.8 ± 19.7% and 89.2±14.3%, respectively. The average increases in the gills of males and females were 166.2±26.9% and 137.7±17.9%, respectively (Table 3). The absorption of carotenoids in the muscle tissue of male and femaleprawns showed no significant differences (Tukey, p>0.05); however, the carotenoid level in gills was significantly (Tukey, p<0.05) higher in males.


 
Thermal shock experiments: The average time of lethargy in cold shock for male and female prawn showed significant differences (Tukey, p<0.05). The shortest lethargy time was related to the control diet and the longest lethargy times in the males and females were related to the AX100and AX150 diets (Table 4).

The results indicated that the AX150 diet led to the latest complete death in shrimp (Table 4). The amount of carotenoids found in the body andgills was significantly reduced by the shocks that the prawn were exposed to during the experimental process. The average percent reduction in totalcarotenoids in the muscle tissue of males and females showed significant differences (Tukey, p<0.05). However, despite a greater reduction in the carotenoid level in the gills of males, this value was not significantly different (Tukey, p>0.05) compared with that observed in females (Table 4). The greatest percent reduction in carotenoid content in the muscle tissue of males and females was observed in those fed the AX150 diet, and the lowest percent reduction was observed in those fed the control diet. In the gills of males, the largest percentage decrease was observed in those fed the AX100 diet and the least reduction was observed in those fed the control diet. The maximum reduction in carotenoids in female gills was observed in those fed the AX150 diet, and the lowest reduction was observed in those fed the AX50 diet (Table 4).
 
Ammonia shock experiments: The average time of lethargy in the ammonia shock experiment was faster in males versus females (Tukey, p<0.05). The shortest lethargy time in both males and females was observed with the control diet, and the longest lethargy time in both males and females was related to the AX150 diet (Table 5). The results indicate significant differences between the average time to complete death of male and female prawns due to ammonia shock (Tukey, p<0.05). The male prawn died faster than the females. The latest complete death in both males and females was observed with the AX100 and AX150 diets, and the fastest time to complete death in both males and females was observed with thecontrol diet (Table 5).

Ammonia shock also reduces the total amount of carotenoids in the muscle tissue and gills of prawns. Our results showed that the total amount of carotenoids was more greatly reduced in the muscle tissue of male versus female prawns (Table 5). The highest percentage reduction incarotenoids in male muscle tissue was observed in those fed the AX150 diet, and the lowest percentage reduction was observed in those fed the control diet; however, in females, the greatest percentage decrease in muscle carotenoids was observed in those fed the AX100 diet. In males, the largest percentage decrease in gill tissue was observed in those fed the AX150 diet, and the lowest decrease was observed in those fed the AX50 diet. A maximum reduction in carotenoids in female gill tissue was observed in those fed the AX150 diet, and the least reduction was observed in those fed the AX50 diet (Table 5).
 
Oxygen reduction shock experiments: Due to the hypo-oxygen shock effect, the male prawns had a faster time to lethargy than the females(Tukey, p<0.05). The latest lethargy time in both males and females was related to the AX150 diet (Table 6). Although the male prawns died laterthan the females, there were no significant differences (Tukey, p>0.05), between the average time to complete death of male and female prawnsunder hypo-oxygen shock. The latest complete death in both males and females was observed with the AX100 diet, and the fastest time to completedeath in both males and females was observed with the control diet (Table 6). There were no significant differences (Tukey, p>0.05) in thereduction of the total carotenoid level in the muscle tissue of male and female prawns (Table 6). The highest percentage reduction in carotenoids in muscle tissue was observed with the AX150 diet (Table 6). The greatest reduction in carotenoids in male and female shrimp gills was observed with the AX150 diet, and the lowest reduction was observed with the control diet (Table 6).

Discussion

Research has shown that carotenoids positively affect shrimp survival under stress conditions; this has been supported by the studies of Chien et al. (2003). The current study revealed that the absorption rate of carotenoids in the gills and muscle tissues of male and female M. nipponense prawn was not significantly different after the shrimp consumed foods containing astaxanthin for two weeks.

It has been reported that resistance of juvenile shrimp to thermal stress increases with increased amounts of astaxanthin in the diet. The currentstudy has shown that with an increase in astaxanthin in the diet, the mean time to lethargy and death in prawns is increased, and prawn that received more astaxanthin during their growing period had longer time-to-lethargy and time-to-death periods during the shock treatments. An increase in astaxanthin in the diet from 100mg/kg to 150mg/kg had no effect on the increased resistance to thermal shock. Most likely, an increase inastaxanthin in the diet will be accompanied by a decrease in intestinal absorption (Stanier et al., 1971).

Male prawns showed greater resistance against thermal shock. This result most likely occurred because males have a harder shell thanfemales, which offers greater resistance. Due to thermal shock, the amount of carotenoids in muscle tissue and gills was considerably decreased. The reduction in the muscle tissue and gills was not significantly different (Tukey, p>0.05) between males and females. This decrease is most likelydue to the direct effects of carotenoids in muscle tissues and gills under conditions of thermal stress (Wan-Yu, Kuan-Fu, I-Chiu, & Yen-Ling, 2004).

The greatest carotenoid reduction in muscle tissue and gills was observed in prawn fed the AX100 and AX150 diets. This result may be due to thehigher amounts of carotenoids in the muscle tissues and gills of prawns fed these two diets at the time that thermal shock began. When the amount of carotenoids in muscle tissues and gills at the beginning of the shock period is higher, the loss will be greater during the time that the prawns areexposed to more stressful conditions.

Our observations have shown that the average time to lethargy and complete death under thermal shock was greater in prawns fed diets containing astaxanthin versus control prawns. These results indicate that astaxanthin, as one of the carotenoids, has increased the resistance of the tested prawns against thermal shock, and prawns demonstrated increased resistance against thermal shock when they were fed diets containingastaxanthin (Frankenberg, Jackson, & Clegg, 2000). While prawns fed astaxanthin took longer to become lethargic (faint), they died much soonerthan the control shrimp.

Ammonia is known to be toxic to aquatic animals (Kinne, 1976). As it penetrates cell membranes, ammonia causes severe changes in cells, leading to rapid cell death (Becker, 2011). An increase in the amount of ammonia in the water, followed by an increase in the blood and hemolymph of prawns, will decrease blood oxygen transport and lead to over-consumption of oxygen in the cells, which causes damage to important tissues,including the gills. If prawns remain in an environment containing ammonia, they may experience a quick death depending on the ammonia concentration (Tomasso, 1994).

This study has shown that prawns exposed to different treatments under 0.75ml/L ammonia, control prawns, and prawns fed an AX50 diet, showed lethargy earlier than prawns exposed to the other two treatments; however, the time to complete death of control prawns was faster than that of prawns exposed to the other treatments.

These results have shown that during exposure to toxic ammonia and cellular oxygen loss (Sies, 1991), astaxanthin in the gills and muscles ofprawn fed with a control diet could cause the accumulation of intracellular oxygen radicals due to oxygen-induced reactions with the long carbonchains. As a result, the damage caused by oxygen free radicals in the cells of significant tissues (such as the gills, kidneys, and muscles) is reduced, and prawn mortality is delayed.

Storey (1996) reported that ammonia poisoning is usually associated with a lack of access to dissolved oxygen, and this usually leads tooxidative stress. In aquaculture, ammonia is absorbed through the gills and skin into the blood and hemolymph (Chen, Nan, & Kuo, 1991). Therefore, if the animal’s body surface area is larger, an increase in ammonia absorption will occur (Vedel, Korsgaard, & Jensen, 1998). This phenomenon may have caused the faster mortality of male versus female prawns. Because the male prawns were larger than the females, the timeto lethargy and complete death occurred faster in male prawns compared with females. The same phenomenon caused males to lose morecarotenoids in ammonia shock compared with females. This effect was evidenced by the reduction in the amount of carotenoids in muscle and gilltissues of males compared with females.

In gills, the percentage reduction in carotenoids in the tissue was significantly different between the AX150 and AX100 diets, with the gill tissue in shrimp fed the AX150 diet showing a greater loss compared with gill tissue in prawn fed the AX100 diet after the shock. Given that the target tissue of ammonia is the gill tissue, the carotenoid reduction in the gill tissue of the shrimp fed the AX150 diet was greater than that observed with the othertreatments. It is possible that reduced levels of carotenoids in this tissue indicate that more carotenoids were used to counteract the toxic effects ofammonia.

Studies have shown that diets containing carotenoids can increase the resistance of crustaceans (Chien et al., 1999). Chien et al. (2003) showed that shrimp fed diets containing astaxanthin showed less oxygen consumption than control shrimp under hypoxia. A similar result was obtained byChien et al. (1999) using the shrimp Penaeus monodon.

It is possible that astaxanthin, similar to other carotenoids containing oxygen such as lutein (Czeczuga, 1979), may also have oxygen attached to the carbon chain (Karnaukhov, 1979) and may provide an intracellular oxygen supply to salmon eggs that are exposed to oxygen deficiency(Craik,1985). Such intracellular oxygen reserves or oxygen acceptors may be involved in the resistance of aquatic organisms to hypoxia (Latscha, 1990; Oshima, Ojima, Sokamoto, Ishiguro, & Terao, 1993).

This increases the resistance of crustaceans to hypoxia (Chien & Jeng, 1992). The main carotenoid in the crustacean body is astaxanthin (Ishikawa, Miyake, & Yasuie, 1966; Arredondo-Figueroa, Pedroza-Islas, Ponce-Palafox, & Vernon-Carter, 2003; Ponce-Palafox et al., 2006). Theshrimp Kuruma (M. japonicus), which has a high level of astaxanthin in its tissues, can tolerate hypoxic conditions without water transportation (Baileg-Broch & Moss, 1992). This study has shown that prawn fed with AX150 diets, which was the highest astaxanthin level used in this study,spent a significantly longer period of time under hypoxic conditions prior to reaching a state of lethargy. This group, along with prawns fed an AX100 diet, later showed complete death.

The results of this study have shown that the amount of muscle tissue and gill carotenoids in prawn fed with an AX150 diet showed greaterreduction than those exposed to other treatments. It is possible that higher levels of astaxanthin in the body under oxygen reduction stress can be beneficial for prawns. These results suggest that male prawns showed lethargy earlier than females, and the percentage of carotenoid reduction inmuscle and gill tissues was higher in males.

Acknowledgments

This experiment was conducted based on the support of Jehade-E-Agriculture Ministry, Iran and also Mirza Koochak Khan Higher Fisheries Center, University of Jame-e Elmi-Karbordi, Rasht, Iran.



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1. Mirza Koochak Khan Higher Fisheries Centre, University of Jame-e Elmi- Karbordi, Rasht, Iran; btizkar@yahoo.com
2. Animal Science Department, Rasht Branch, Islamic Azad University, Rasht, Iran; alirezaseidavi@iaurasht.ac.ir
3. Centro Multidisciplinario de Bahía de Banderas, Escuela Nacional de Ingeniería Pesquera, Lab. Bioingeniería Costera, Universidad Autónoma de Nayarit, Tepic. 63155. Nayarit, México; jesus.ponce@usa.net
4. Fishery Department, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran; parastoo1980@yahoo.com

Received 20-I-2014. Corrected 25-V-2014. Accepted 26-VI-2014.

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