Hidrobiológica 2008, 18 (2): 147-154
Oxidative damage in tissues of juvenile crayfish (Cherax quadricarinatus
von Martens, 1868) fed with different levels of proteins and lipid
Daño oxidativo en tejidos de acociles juveniles (Cherax quadricarinatus
von Martens, 1868) alimentados con diferentes niveles de proteínas y lípidos.
Tania Zenteno-Savín1,
Edilmar Cortes-Jacinto2*,
José Pablo Vázquez-Medina1
& Humberto Villarreal-Colmenares2
1
Planeación Ambiental y Conservación, 2Programa de Acuicultura, Centro de Investigaciones Biológicas del Noroeste
(CIBNOR), Mar Bermejo 195, Playa Palo Santa Rita, La Paz, B.C.S., 23090, México. *E-mail: ecortes04@cibnor.mx
Zenteno-Savín T., E. Cortes-Jacinto, J. P. Vázquez-Medina & H. Villarreal-Colmenares. 2008. Oxidative damage in tissues of juvenile crayfish (Cherax quadricarinatus von Martens,
1868) fed different levels of proteins and lipid. Hidrobiológica 18 (2): 147-154.
ABSTRACT
This experiment investigated the effect of dietary protein and lipid levels on superoxide radical production and lipid
peroxidation in juvenile redclaw crayfish, Cherax quadricarinatus. Nine practical diets were formulated to contain a
combination of three crude protein (CP) (26, 31, and 36%) and three crude lipid (CL) (4, 8, and 12%) levels. Four replicate
groups of 15 crayfish (0.71 ± 0.13 g) per diet treatment were stocked in 40 L tanks, at 28 °C for 60 days. The control group
was fed with a commercial shrimp diet. After the feeding period, superoxide radical (O2−) production and lipid peroxidation,
measured as thiobarbituric acid reactive substances (TBARS) of muscle, digestive gland and gill were analyzed. In the
group fed the control diet, O2− production and TBARS levels were significantly higher in the digestive gland than in
muscles or gills. There was no effect of dietary protein or lipid level on O2− production in the digestive gland, muscle,
and gill. However, dietary protein level significantly affected TBARS levels in crayfish gills (p < 0.05). The results suggest
tissue-specific effects of dietary protein and lipid levels on indicators of oxidative stress in redclaw. Results indicate that
a diet containing 31% CP and 8% CL provided adequate amounts of protein and lipid to satisfy nutritional requirements for
optimal growth, while preventing diet-induced oxidative stress and protecting the integrity of the immune function.
Keywords: Cherax quadricarinatus; lipid peroxidation; oxidative stress; superoxide radical production.
RESUMEN
Se realizó un estudio para evaluar el efecto de diferentes niveles de proteínas y lípidos en dietas prácticas sobre la
producción de radical superóxido y el daño oxidativo en acociles juveniles Cherax quadricarinatus. Se evaluaron nueve
dietas prácticas que contenían tres niveles de proteínas crudas (PC) (28, 35 y 40%) y tres niveles de lípidos (LC) (4, 8 y
12%). Cuatro grupos de 15 acociles (0.71 ± 0.13 g) por tratamiento fueron sembrados en acuarios de 40 L a 28 °C durante
60 días. El grupo control fue alimentado con una dieta comercial para camarón. Transcurrido el periodo de alimentación,
los organismos fueron sacrificados y se midió la producción endógena de radical superóxido (O2−) y la peroxidación
de lípidos (sustancias reactivas al ácido tiobarbitúrico, TBARS) en extractos tisulares de músculo, glándula digestiva,
y branquias. En los acociles alimentados con la dieta control, la producción de O2− y los niveles de TBARS fueron
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Zenteno-Savín T., et al.
significativamente mayores en la glándula digestiva que en el músculo o en las branquias. Los niveles de proteínas o
lípidos en la dieta no tuvieron un efecto significativo sobre la producción de O2− en ninguno de los tejidos estudiados.
Sin embargo, sí afectaron significativamente los niveles de TBARS en las branquias (p < 0.05). Los resultados indican
que los niveles de proteínas y lípidos contenidos en la dieta del acocil, tienen un efecto sobre los indicadores de
estrés oxidativo, y que este efecto es específico dependiendo del tejido; en este acocil una dieta con 31% PC y 8% LC
proporciona el requerimiento adecuado de proteínas y lípidos para crecimiento óptimo, previniendo el estrés oxidativo
y protegiendo la integridad de la función inmune.
Palabras clave: Estrés oxidativo; Cherax quadricarinatus; peroxidación lipidíca; producción de radical superóxido.
INTRODUCTION
Cherax quadricarinatus (von Martens, 1898), the redclaw
crayfish, is an omnivorous species, native to northern Australia
and recently introduced in Mexico for culture purposes (CortésJacinto et al., 2003a,b). Under aquaculture conditions, an appropriate diet that meets the specific nutrient requirements for
the species at each developmental stage must be provided to
avoid nutritional imbalances, physiological changes, and disease (Harrison, 1990; Scott, 1999; Campaña-Torres et al., 2005).
Dietary protein level is probably the most important element
affecting growth of cultured species (Cortés-Jacinto et al., 2003a;
Thompson et al., 2003; Campaña-Torres et al., 2005), while dietary
lipids are an important source of calories (Hernández-Vergara et
al., 2003; Cortés-Jacinto et al., 2005). The effects of dietary protein and lipid levels in aquaculture have been studied in terms of
weight gain, and growth and survival rates (Hernández-Vergara
et al., 2003; Thompson et al., 2003; Cortés-Jacinto et al., 2005).
Dietary protein and lipid levels affect the production of
reactive oxygen species (ROS) and the oxidative stress response
in mammals (Rana et al., 1996; Mataix et al., 1998; Schwerin et
al., 2002; Luna-Moreno et al., 2007). In fish, in vivo lipid peroxidation from ROS is a cause of several diseases (Sakai et al.,
1998). The oxidative stress response is an important component
of the defence mechanism in crustaceans (Winston et al.,
1996; Holmblad & Söderhäll, 1999; Campa-Córdova et al., 2002;
Kovacevic et al., 2006, Mercier et al., 2006a). Changes in dietary
protein and lipid levels can potentially compromise the immune
function via an altered oxidative stress response in crustacean
species in aquaculture (Campa-Córdova et al., 2002). The effect
of dietary protein or lipid levels on the oxidative stress response
in crustaceans has only recently been addressed (Dutra et al.,
2007). This study was undertaken to investigate the effect of different levels of dietary protein and lipids on free radical production
and oxidative damage in juvenile redclaw crayfish.
MATERIALS AND METHODS
Experimental diets. Experimental diets were formulated to
contain three levels of crude protein (26, 31, and 36%) and three
levels of lipids (4, 8, and 12%) and were prepared as described by
Cortés-Jacinto et al. (2003a). Proximate analyses of diets (Table
1) were determined according to AOAC (1995). Gross energy of
the diet was measured in an adiabatic bomb calorimeter (Model
1261, Parr, Moline, IL, USA). Juvenile redclaw crayfish were
initially fed a ration of 5% of biomass per day. Each day, 30% was
feed at 8:00, 30% feed at 14:00 and 40% feed at 20:00 according to
Cortés-Jacinto et al. (2003b) during a 60-day trial. The following
morning leftover feed, which could be readily identified by its
swollen pellet shape, was removed and quantified by estimating
the amount in its original dry form, and the rations were adjusted
to minimize the amount of uneaten feed.
Diet water stability. The amount of dry matter leached from
the pellets was determined as previously described (Obaldo et
al., 2002).
Experimental redclaw crayfish. Juvenile redclaw crayfish (n
= 525, 0.71 ± 0.13 g initial wet weight) were obtained from a stock
at CIBNOR, La Paz, B.C.S., Mexico. The animals were maintained
according to recommendations by Cortés-Jacinto et al. (2003b).
Redclaw crayfish were held in 40 L fiberglass aquaria at a stocking density of 15 redclaw per tank. Juvenile crayfish that died
during the first three days of experiment were replaced with those
held under identical conditions. Temperature was maintained at
28.01 ± 0.33 °C with 100-W heaters (Aquarium Pharmaceuticals,
Paris, France), and a 14L/10D-photoperiod during the 60-day
experiment. An air stone in each tank provided constant aeration.
Uneaten feed and feces were siphoned from each tank daily. After
siphoning, 30% of the tank water was replaced daily with fresh tap
water. Water quality was monitored and maintained well within
recommended limits for redclaw crayfish (Villarreal, 2000). Each
diet was fed to only one of the crayfish groups. The control group
was fed a commercial shrimp diet of pellets with 36.7% protein,
and 12.6% lipids (PIASA®, La Paz, B.C.S., Mexico). Five specimens
with a mean weight of 6.3 ± 0.27 g were randomly selected from
each group for analyses of superoxide radical (O2−) production
and lipid peroxidation.
Biochemical analysis of superoxide radical (O2−) production and lipid peroxidation. At the end of the experiment, five
crayfish from each treatment were sacrificed by immersion in
Hidrobiológica
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Dietary-induced oxidative damage in crayfish
Table 1. Proximate composition of the experimental diets (g/100 g dry matter).
Diets (% protein/% lipids)
26/4
26/8
26/12
31/4
31/8
31/12
36/4
36/8
36/12
26.7±0.01
26.7±0.07
26.7±0.12
31.7±0.06
31.5±0.03
31.5±0.12
36.4±0.09
36.3±0.16
36.6±0.09
4.3±0.06
8.8±0.03
12.3±0.02
4. 9±0.09
8.3±0.07
12.2±0.08
4.9±0.03
8.7±0.09
12.1±0.08
7.0±0.02
6.9±0.03
8.2±0.03
8.3±0.06
8.3±0.05
6.9±0.02
9.5±0.04
9.8±0.03
9.6±0.08
0.39±0.04
0.69±0.07
0.25±0.01
0.27±0.02
0.39±0.01
0.69±0.01
1.53±0.18
1.04±0.23
1.23±0.03
54.8
50.0
45.1
48.7
44.4
41.5
41.1
35.3
33.6
17.5
18.0
19.2
17.5
18.2
19.1
17.9
18.7
19.4
15.2
14.8
13.9
18.1
17.3
16.5
20.3
19.4
18.8
92.3±1.2
94.9±0.2
96.0±0.4
92.8±0.6
93.2±1.5
95.3±0.9
93.7±0.7
94.8±1.1
96.8±0.7
Protein1
Ether extract1
Ash1
Fiber1
2
NFE
Gross energy (kJ-1)
P:E
(mg kJ–1) 3
Water stability (%)4
1Mean
± SD, n = 3.
= nitrogen free extract, calculated by difference.
3P:E = protein to energy ratio
4
(%) = Percent dry matter retention
2NFE
liquid nitrogen. After dissection over ice, the muscle, digestive
gland, and gills were removed, placed in cryovials, and immediately immersed in liquid nitrogen and stored at –80 °C until
analyzed.
Superoxide radical production. Endogenous O2− production
was assessed as an index of the tissue capacity for production
of ROS by spectrophotometry during the reduction of ferricytochrome c (Drossos et al., 1995; Zenteno-Savín et al., 2006). Each
sample was placed in a test tube containing Krebs-Henseleit
buffer (0.11 M NaCl, 4.7 mM KCl, 12 mM MgSO4, 12 mM NaH2PO4,
25 mM NaHCO3, 1 mM glucose). Then 15 µM cytochrome c (Type
VI from horse heart, SIGMA) was added to the sample and was
incubated for 15 min in a shaking water bath at 37 °C; then 3
mM N-ethylmaleimide was added to inhibit further reduction of
cytochrome c. The tubes were then centrifuged at 4000 × g at 4
Vol. 18 No. 2 • 2008
°C for 10 min. Supernatants were removed and the absorbance
was read at 550 nm in a spectrophotometer (Model 6305, Jenway,
Princeton, NJ, USA). A mixture containing the same reagents was
added to the pellet and used as a blank for each sample, after
incubation and centrifugation at the same conditions. The amount
of O2− produced was calculated by dividing the absorbance by the
extinction coefficient for the change between ferricytochrome c
and ferrocytochrome c, E550 = 21 nM cm–1. Results were expressed in nanomoles of O2− per minute g–1 wet tissue.
Lipid Peroxidation. Lipid peroxidation was assessed as an
index of the damage induced by ROS by measuring the tissue
content of TBARS (Ohkawa et al., 1979; Olsen & Henderson, 1997;
Zenteno-Savín et al., 2006). Each sample was homogenized in two
volumes of isotonic crustacean solution (450 mM NaCl, 10 mM
KCl, 1 mM PMSF). The homogenized sample was incubated for 15
150
Zenteno-Savín T., et al.
A
B
Figure 1. (A) Superoxide radical production (O2−, nmol min–1 g–1 wet tissue); (B) lipid peroxidation levels (TBARS, nmol g–1 wet tissue) in tissues of
juvenile redclaw crayfish Cherax quadricarinatus fed the control diet. N = 5. * = p < 0.05 differences among tissues. Endogenous O2 − production
was assessed following the method of Drossos et al. (1995); lipid peroxidation was quantified as the concentration of thiobarbituric acid reactive
substances (TBARS, Ohkawa et al., 1979).
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Dietary-induced oxidative damage in crayfish
Table 2. Superoxide radical production (O2−, nmol min–1 g–1 wet tissue) and lipid peroxidation levels (TBARS, nmol g–1 wet tissue) in tissues
of juvenile redclaw crayfish fed different levels of protein and lipid.
Diet
Tissue
(protein/lipids)
26/4
26/8
26/12
31/4
31/8
31/12
36/4
36/8
36/12
Control
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
Gills
Digestive gland
Muscle
O2− (nmol min–1 g–1)
TBARS (nmol g–1)
Mean ± s.e. (n)
Mean ± s.e. (n)
0.204 ± 0.033 (5)
0.913 ± 0.130 (4) *
0.008 ± 0.001 (5)
0.188 ± 0.048 (5)
1.226 ± 0.155 (4)*
0.008 ± 0.002 (5)
0.174 ± 0.042 (5)
2.540 ± 0.162 (4)*
0.005 ± 0.002 (4)
0.178 ± 0.042 (5)
1.990 ± 0.874 (4)*
0.010 ± 0.005 (5)
0.189 ± 0.050 (5)
1.275 ± 0.368 (4)*
0.010 ± 0.004 (5)
0.166 ± 0.006 (5)
1.310 ± 0.275 (5)*
0.008 ± 0.003 (5)
0.302 ± 0.072 (5) a
1.540 ± 0.024 (5)*
0.012 ± 0.005 (5)
0.275 ± 0.080 (5)
1.090 ± 0.327 (5)*
0.014 ± 0.003 (5)
0.166 ± 0.059 (5)
2.541 ± 0.933 (4)*
0.004 ± 0.001 (5)
0.147 ± 0.137 (45) a
2.784 ± 0.238 (44)*
0.163 ± 0.026 (45)†
19.7 ± 4.7 (5) a
340.7 ± 16.5 (4)*
10.5 ± 3.0 (5)
17.2 ± 3.0 (5) b
182.2 ± 127.4 (4)*
10.4 ± 3.2 (5)
34.9 ± 9.0 (5)
281.7 ± 185.9 (4)*
3.1 ± 0.3 (5)
73.5 ± 3.7 (5) a,b,c
2041 ± 47.3 (4)*
2.9 ± 0.9 (4)
80.0 ± 4.7 (5) a,b,d
6553 ± 148.0 (4)*
113 ± 2.5 (5)
68.8 ± 2.7 (5) b,e
344.4 ± 158.8 (5) *
7.4 ± 2.7 (5)
7.0 ± 1.4 (5) c,d,e
649.7 ± 335.5 (5)*
8.1 ± 1.8 (5)
17.0 ± 6.1 (5) c,d,e
610.9 ± 188.3 (5)*
13.2 ± 1.6 (5)
10.5 ± 4.9 (4) c,d,e
596.6 ± 386.7 (4)*
6.3 ± 1.4 (5)
31.3 ± 4.7 (43) c,d
518.8 ± 46.5 (44)*
25.1 ± 5.0 (45)
*P < 0.05 differences among tissues; †P < 0.1 effect of diet; values within columns with the same alphabetical superscript are significantly different
at p < 0.05.
min at 37 °C on a shaking water bath; the reaction was stopped
by addition of ice cold 0.8 M HCl in 12.5% trichloroacetic acid
(SIGMA). After adding 1% thiobarbituric acid (SIGMA), samples
were incubated for 10 min in a boiling water bath, cooled to room
temperature, and centrifuged at 4000 × g for 10 min at 4 °C. The
supernatant was read at 532 nm in a spectrophotometer (Model
6305, Jenway, Princeton, NJ, USA). A standard curve of malondialdehyde bis (diethyl acetal) (SIGMA) was run in parallel with
the samples and the concentration of TBARS in the samples was
calculated from this standard curve. Results were expressed in
nM of TBARS g–1 wet tissue.
Vol. 18 No. 2 • 2008
Statistics. The SYSTAT software (SPSS, Richmond, CA, USA)
was used for data analysis. Results are presented as mean ±
SE for at least five redclaw crayfish in each treatment group.
Normality and homogeneity of variances of the data were tested
with the Kolmogorov–Smirnoff and Cochran’s C tests, respectively.
Differences between means with respect to diet were tested with
ANOVA followed by Bonferroni post-hoc tests for multiple comparisons. Statistical analyses were performed independently for
O2− production and TBARS. To determine if there were differences
among tissues, an ANOVA with the Bonferroni post hoc test was
performed for each diet group. Significance was set at p < 0.05.
152
Zenteno-Savín T., et al.
RESULTS
Experimental diets. Reasonably good pellet stability in
water was achieved in all experimental diets. Between 92.3 ±
1.2% and 96.8 ± 0.7% of the dry matter was retained after 1 h for
all pellet types. Proximate composition (protein, fat, fibre, and
ash), nitrogen-free extract, and gross energy content of nine
practical diets are shown in Table 1.
Superoxide radical production. Superoxide radical production in muscle, digestive gland, and gills of C. quadricarinatus fed
different levels of proteins and lipids are presented in Table 2.
Production of O2− was different among tissues, even in crayfish
fed the control diet (Fig. 1A). In all treatment groups, O2− production was higher in the digestive gland than in muscle or gills.
There was no effect of dietary protein/lipid levels on O2− production in the crayfish digestive gland. However, O2− production was
higher in muscle in crayfish fed the control diet than those fed
experimental diets (p < 0.1, Table 2). O2− production in the gills of
crayfish fed the 31/4 diet was significantly higher than in the gills
of animals fed the control diet (Table 2).
Lipid peroxidation. Lipid peroxidation (TBARS) levels in
juvenile redclaw tissues are presented in Table 2. TBARS was
different among tissues, even in crayfish fed the control diet
(Fig. 1B). In all treatment groups, TBARS levels were higher in
the digestive gland than in muscle or gills. There was no differential effect of levels of dietary protein/lipids in TBARS levels in
crayfish muscle or digestive gland. However, significant differences were found among diets in crayfish gills (Table 2). TBARS
levels in gills of crayfish fed diets with 31% protein, regardless
of dietary lipid content, were significantly higher than in crayfish
fed the control diet (31.3 ± 4.7 nmol g-1). TBARS levels in gills from
crayfish fed the 26/4, and 26/8 (19.7 ± 4.7, and 17.2 ± 3.0 nmol g-1,
respectively) diets were significantly lower than those fed the
31/4, and 31/8 diets (73.5 ± 3.7, and 80.0 ± 4.7 nmol g-1, respectively), while TBARS levels in gills from crayfish fed 31% protein
were significantly higher than those fed 36% protein, regardless
of dietary lipid content (p < 0.05).
DISCUSSION
Significant differences were found in TBARS levels among
diets in gills of crayfish (Table 2). Crayfish fed 26% protein had
lower TBARS levels in gills than those fed 31% protein, while the
latter had higher TBARS levels than those fed 36% protein, regardless of dietary lipid content (p < 0.05). Increased production of
TBARS could be the result of increased levels of other ROS, such
as hydrogen peroxide or hydroxyl radical, or a direct effect of the
dietary protein/lipid composition. In crayfish, gills also have an
excretory function (Vogt, 2002); it is possible that the oxidative
damage in crayfish gills is a consequence of the excretion of an
increased protein load.
Production of O2− and TBARS levels were different among
tissues, even in crayfish fed the control diet (Fig. 1). In all treatment groups, O2− production and TBARS levels were higher
(p < 0.05) in the digestive gland than in the muscle or gills (Fig. 1).
Similar differences in O2− production and TBARS levels between
digestive gland, muscle, and gills in whiteleg shrimp Litopenaeus
vannamei were found by Zenteno-Savín et al. (2006).
Dietary nutrient supply affects health and performance of
terrestrial and aquatic organisms. Other reports indicate that
dietary lipid and protein levels increase free radical production
and oxidative damage indicators. Ingestion of specific fatty
acids, such as polyunsaturated fatty acids, play an important
role in O2− production (Mercier et al., 2006b) and free radicalmediated lipid peroxidation (Tocher et al., 2002). Ingestion of
dietary protein in excess of metabolic amino acid requirements
increases production of ROS in mitochondria, leading to oxidative stress and resulting in lipid peroxidation (Harper, 1994;
Benzie, 1996). Decreased antioxidant defences and increased
lipid peroxidation were found in liver of rats fed a protein-deficient diet compared to rats fed an isocaloric normal protein
diet; severe protein energy malnutrition resulted in hepatic
injury (Rana et al., 1996). Schwerin et al. (2002) found increased
expression of genes involved in the oxidative stress response,
along with upregulation of gene expression and neuronal signaling in pigs fed soy (versus casein) as dietary protein. Dietary
lipids have a differential effect on specific tissue membrane
composition in rats, and it was suggested that lipid peroxidation
levels are dependent on both tissue type and diet (Mataix et
al., 1998).
The effects of dietary protein or lipid levels on free radical response have only recently been studied in crustaceans.
While Dutra et al. (2007) found decreased lipoperoxidation
levels in Hyalella fed a restricted caloric diet, the results from
our study suggests that isocaloric changes in dietary protein or
lipid content do not significantly increase oxidative damage to
lipids in muscle or digestive gland of juvenile crayfish. That O2·−
production and lipid peroxidation levels were not significantly
changed in the digestive gland or muscle of crayfish and that
the diets were not supplemented with antioxidants suggest
that crayfish have sufficient antioxidant defences to counteract
the oxidative stress potentially induced by changes in dietary
protein or lipid levels. Still, further detailed studies are needed
to corroborate this.
Increased lipid peroxidation in gills of crayfish on diets
with 31% protein was not expected and suggests that protein
and lipid metabolism, absorption, and deposition are adjusted to
maintain structural and functional properties in active tissues,
such as muscles and the digestive gland. This result agrees with
findings in mammals of tissue-specific effects of dietary protein
and lipids on indicators of oxidative stress (Mataix et al., 1998).
Dietary-induced oxidative damage in crayfish
153
Alternatively, the differences among tissues may reflect their
regenerative capacity (Ochoa et al., 2003), suggesting that gills
of juvenile crayfish have a lower regenerative capacity than
muscles or the digestive gland. It is possible that dietary protein
and lipid levels directly affect the membrane lipid composition in
crayfish gills by increasing either availability or oxidation rates
of fatty acids.
BENZIE, I. F. 1996. Lipid peroxidation: a review of causes, consequences,
O2− production did not change with diet in tissues, specifically the gills of juvenile redclaw crayfish. This does not rule out
increased formation of other ROS, which were not measured in
this study. It would be interesting to find other ROS produced in
crayfish gills and if this production is dependent on protein or
lipid contents in the diet. Our results suggest that crayfish have
enhanced antioxidant defences and warrant a detailed study of
the main antioxidant enzymes in this species. ROS production is
an important component of the immune response in crustaceans
(Winston et al., 1996; Holmblad & Söderhäll, 1999; CampaCórdova et al., 2002; Kovacevic et al., 2006; Mercier et al., 2006a);
the increased lipid peroxidation found in gills suggests a closer
look at the immune response in tissues of crayfish fed diets with
different protein and lipid levels. Details on growth, survival, and
feed conversion are presented in Cortés-Jacinto et al. (2005).
CAMPAÑA-TORRES, A., L. R. MARTÍNEZ CÓRDOVA, H. VILLARREAL
COLMENARES & R. CIVERA CERECEDO. 2005. Estudio de los parámet-
Our results suggest that, in a fashion similar to what has
been observed in mammals (Mataix et al., 1998; Ochoa et al.,
2003), levels of dietary protein and lipid have a differential effect
on specific tissue membrane composition, affecting lipid peroxidation levels in different ways in gills, muscle, and the digestive
gland in juvenile redclaw crayfish. Similarly, these results suggest that a diet for juvenile redclaw crayfish that provides adequate protein and lipids is 31/8. This appears to satisfy nutritional
requirements for optimal growth, prevent diet-induced oxidative
stress, and protect the integrity of the immune function.
ACKNOWLEDGMENTS
The authors thank Sonia Rocha and Norma O. Olguín Monroy
for providing valuable assistance with chemical analyses, and
Sandra de La Paz and Mildred Cortés for maintaining the experimental system. Félix Córdoba† (UNAM) provided constructive
comments. This research was funded by CONACyT grant 40548
and CIBNOR grants AC1.5, PAC2.6, PC2.5 and PC2.6. E. CortésJacinto is a CONACyT postdoctoral fellow at the Universidad de
Sonora (DICTUS), Sonora, Mexico.
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Recibido: 2 de mayo de 2007
growing rats. Human and Experimental Toxicology 15: 810-814.
Aceptado: 5 de junio de 2008
Hidrobiológica