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Effect of Feed on the Mineral Composition of Labeo Rohita

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Khalid Javed Iqbal*1, Muhammad Ashraf1, Arshad Javid2, Farzana Abbas1, Muhammad Hafeez-ur-Rehman1, Fayyaz Rasool1, Noor Khan1 , Sumaira Abbas1 and Muhammad Altaf 2

ABSTRACT

Studies were conducted to evaluate the effect of plant-fishmeal feed and/or plant by-product based feed on minerals composition of Labeo rohita. Fish fed on rice polish alone served as control (T0). Feed ingredients were grouped together with two ingredients in each test diet which served as an independent trial during these studies. Group 1(T1) contained guar meal and canola meal, group 2(T2) soybean meal and cotton seed meal, group 3(T3) guar meal and cotton seed meal, group 4(T4) soybean meal and canola meal and group 5(T5) fishmeal and canola meal. Each group including control had two replicates. 12 earthen ponds with uniform area of 0.03 ha each, were randomly stocked with 100 fish (average weight 200 g) in each following standard stocking protocols. All the 12 ponds were then randomly allotted to individual treatment including control group. Experimental fish were fed @ 4% of their wet biomass twice a day. Minerals specifically Na, Ca, Fe, Zn, and Cu significantly differed (P≤0.05) among treatments which might be linked with their variable release in digestive system of fish in the presence of various anti-nutritional factors.

Key Words: fishmeal; soybean meal; canola meal; Ca; Na.

INTRODUCTION

Fish is rich in animal protein, low in cholesterol and high in unsaturated fatty acids (Kromhout et al., 1995; Zenebe et al., 1998a; Arts et al., 2001; Fawole et al., 2007) and due its these peculiar qualities is preferred over red meats (Sadiku and Oladimeji, 1991; Mozaffarian et al., 2003; Foran et al., 2005;). Nutritional quality of fish is however, not uniform and varies a lot among different fish species even within species when cultured under environments and different culture systems. Among herbivorous fish varieties Labeo rohita is preferred among consumers due to its typical taste and texture and among culturists due to growth, hardiness and wide range feeding habits. That is the reason that it is dominant fish in current fish cultural practices (Khan et al., 2004; Hussain et al., 2011; FAO, 2000; Chaudhuri et al., 1974).

Other than nutritional competencies the fish is an important economic source, and its culture is rapidly growing not only in developing countries but in developed contraries too (Delgado et al., 2002; Louka et al., 2004). The success of fish culture depends on availability and selection of appropriate diets that are proficiently digested, are cost effective and provide the necessary nutrients for optimal growth (Mokolensang et al., 2003). Improvement and selection of appropriate feed ingredients has pronounced effect on the nutritional values, fish growth and its adjunct qualities (Shioya et al., 2011; Yang et al., 2011). Cost effective quality feed has pivotal role in fish production and has always been a constraint in the expansion of fish culture and in sustained development of aquaculture industry. It determines growth, flesh composition, especially lipid, mineral content of produced fish and ultimately market response (Izquierdo et al., 2003; Rasmussen, 2001).

Among other nutrients minerals also has an important role and contribute to the growth of fish being an integral components of many enzymes involved metabolism (Glover and Hogstrand, 2002). Several minerals are required for proper development and normal execution of organism’s bodily functions as Ca is necessary element for the bone development (Erkan and Ozden, 2007) and Ca, Mg, Na and K, are involved in cellular metabolism which are usually found in higher quantities in biological tissues (Wagner and Boman, 2003). Zn is well known to be involved in most metabolic pathways in plants and animals (Hambidge, 2000). Copper, iron and manganese are essential for maintenance of normal growth and reproduction (Turkmen et al., 2005; Roy and Lall, 2006). Fish is a major source of Fe (Fraga, 2005) which is involved in blood synthesis in liver (Wagner and Boman, 2003), is an integral component of oxygen carrying protein from lungs to the tissues (Wagner and Boman, 2003; Camara et al., 2005). Mn is required in minute quantities on daily basis for better health and growth in humans and its deficiency may result in nervous system disorder (Agency for Toxic Substances and Disease Registry, 2004). Keeping in view all the above mentioned concerns the present study is planned to find out the effect of plant-fishmeal feed and/or plant by-product based feed on minerals profile of Labeo rohita.

MATERIALS AND METHODS

Experimental site and study trials

This three month study was conducted in earthen ponds of the Department of Fisheries and Aquaculture, University of Veterinary and Animal Sciences, Ravi Campus Pattoki, using juvenile Labeo rohita as an experimental animal.

Experimental design

Studies were designed following Completely Randomized Design (CRD). There were 5 treatments and a control with two replicates in each group and whole trial was managed in 12 ponds. 100 juveniles of Labeo rohita having mean body weight of 200g were randomly stocked in each pond (0.03 ha) and then all these ponds were arbitrarily distributed among 5 treatments and a control. Five experimental diets pertaining to each treatment, by proportionate ratio of the two feed ingredients was maintained at 1:1 i.e. (T1) guar meal and canola meal, (T2) soybean meal and cotton seed meal, (T3) guar meal and cotton seed meal, (T4) soybean meal and canola meal, (T5) fishmeal and canola meal and a control diet (T0) i.e. rice polish with two replicates in each. Fish were regularly fed @ 4% of wet body weight twice a day.

Proximate analysis

Feed proximate analysis was analyzed by using Büchi NIR Technology (Büchi NIRFlex N-500) Feed were dried and finally ground in pestle and mortar and then placed in sampler cups. The cups were placed in Büchi NIR machine for two minutes which then displayed a complete proximate analysis report which was saved for future use (Table 1).

Table 1 Proximate analysis of feed combinations

Analysis

T1

T2

T3

T4

T5

T0

Protein %

36.76±1.20

38.45±2.29

37.64±2.33

37.56±1.78

40.35±3.02

6.07±0.64

Moisture %

7.08±1.31

9.68±2.11

7.135±.188

9.62±2.26

7.33±1.79

4.92±1.21

Fat %

1.77±0.55

1.42±0.54

1.60±0.87

1.35±0.65

4.87±1.48

3.15±0.29

Ash%

8.23±0.39

12.48±2.13

12.35±2.44

8.35±2.38

15.59±3.49

6.30±1.27

Kcal/g

4.09±1.11

4.07±1.37

4.08±0.89

4.06±1.05

4.25±1.91

4.16±2.01

Mineral analysis

Well ground 0.5 g sample was taken in conical flask which 10 ml HNO3 was added in. Mixture was then boiled for 15 minutes at 60 0C and then 5 ml perchloric acid was added and boiled it again for another 15 minutes at 60 0C. Sample flask was then placed on hot plate and heated till sample volume reduced to 1 ml. This sample was diluted to 100 ml by addition of distilled water. Sodium (Na) and potassium (K) were measured by flame photometric method while calcium (Ca), Iron (Fe), zinc (Zn), copper (Cu) and magnesium (Mg) were determined by an atomic absorption spectrophotometer.

Statistical analysis

The data generated during the course of this trial from various sources was analyzed by one way ANOVA using SAS software to determine the significance of various treatment groups. Difference among various means obtained from computation of treatment data sets was compared by Duncan’s Multiple Range Test to indentify the presence of variations. Probability level for these tests was fixed at P≤0.05.

RESULTS

Mineral composition of Labeo rohita showed statistically significant (P ≤ 0.05) differences in Na, Ca, Fe, Zn and Cu content while non-significant in K and Mg. Significantly higher Na (27.400±0.98 ppm) was observed in fish fed on T2 and the lowest (18.05±5.30 ppm) in T4, similarly significantly higher Ca content was observed in fish fed on T5 (14.245±0.09 ppm) while the lowest in T3 (10.515±0.09 ppm), significantly higher Fe content was recorded for fish fed on T5 (5.960±0.87 ppm) while the lowest in T4 (1.910±0.14 ppm), significantly higher (0.815±0.09 ppm) and lower (0.470±0.04 ppm) Zn contents were observed in T1 and T2. Higher Cu concentrations were recorded in fish fed on T3 (0.045±0.01 ppm) and lower in fish fed on T0 (0.015±0.01 ppm), higher values of K was observed on T2 (68.550±23.97 ppm) while lower for T3 (53.100±2.82 ppm), maximum Mg values were observed for T1 (3.270±0.11 ppm) and minimum for T2 (2.915±0.10 ppm) (Table -2).

Table 2 Effect of feed on mineral composition of Labeo rohita

Minerals

T1

T2

T3

T4

T5

T0

Na (ppm)

24.600±3.54ab

27.400±0.98a

20.800±0.28ab

18.05±5.30b

21.300±0.28ab

23.700±0.42ab

Ca (ppm)

11.870±0.07d

13.240±0.08b

10.515±0.09e

13.145±0.11bc

14.245±0.09a

12.415±0.76dc

Fe (ppm)

4.690±0.11b

2.465±0.80c

2.535±0.15c

1.910±0.14c

5.960±0.87a

5.010±0.14b

Zn (ppm)

0.815±0.09a

0.470±0.04ab

0.680±0.05ab

0.735±0.05ab

0.700±0.06ab

0.620±0.06b

Cu (ppm)

0.025±0.01bc

0.035±0.01ab

0.045±0.01a

0.025±0.01bc

0.035±0.01ab

0.015±0.01c

Mg(ppm)

3.270±0.11a

2.915±0.10 a

3.035±0.15a

3.095±0.13a

3.015±0.19a

3.125±0.19a

K (ppm)

46.400±13.43a

68.550±23.97a

39.150±0.21a

51.300±11.59a

54.950±0.21a

65.350±1.20a

DISCUSSION

In present study mineral composition of Labeo rohita showed significant (P ≤ 0.05) variation in Na, Ca, Fe, Zn and Cu content in different treatments. Statistically significantly higher Na, Ca, Fe, Zn, Cu were observed in fish were observed in T2, T5, T5, T1, T3 while non-significantly higher K and Mg were observed in T2 and T1 respectively. Contrary to our study Khan et al. (2012) observed non-significant variations in mineral content in major carps reared in mono and polyculture systems. Similarly Luczynska et al. (2009) also observed non-significant differences in fishes having different feeding niches. During present study significantly higher Na was observed in fish fed T2 and lower in fish fed wit T4. Comparatively higher Na concentrations were observed in marine fish by Pirestani et al. (2009). Significantly higher Ca was observed in fish fed on T5 and lower for fish fed on T3. Our findings are in line with Babalola, et al. (2011) who observed significant variations in concentration of Ca among different commercial fish species of Nigeria.

Significantly higher Fe content was observed in fish fed on T5 and lower in fish fed on T4 during present analysis. Mean Fe values were observed within the ranges given by Pirestani et al. (2009) in C. carpio. Babalola et al. (2011) observed non significant differences in Fe content among different commercial fishes of Nigeria. Significantly higher Zn was determined in fish fed with T1 while lower on T2 during present study. Contrary to our study Stezycka et al. (2003) observed higher Zn content in non-predatory fishes and marine fish species (Pirestani et al., 2009). During present study significantly higher Cu concentration was determined in fish, fed on T3 while lower for T0 diet. Contrary to our study Pirestani et al. (2009) observed higher Cu concentrations in fish collected from South Caspian Sea. During present analysis higher Mg concentrations were observed in fish fed on T1 while lower for T2 diets. Our findings confirm Babalola et al. (2011) who observed non-significant differences in Mg content among different commercial fishes of Nigeria. Contrary to our observations Pirestani et al. (2009) found significantly higher Mg content in different commercial fishes of Nigeria. During present study higher K values were determined for fish fed on T2 while lower for T3. Contrary to our study significantly higher K contents were recorded in different commercial fishes of Nigeria (Pirestani et al. 2009), freshwater fish species (Achionye-Nzeh et al. 2011) and commercial fishes of Sudan (Mohamed et al. 2010).

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