Effect of Food Particle Size, Stocking Density and Feeding Frequency on the Growth Performance of Juvenile Korean Rockfish Sebastes schlegelii

AbstractDevelopment of formulated starter diets and improvement of diets for juvenile marine fish species are major challenges in aquaculture. The ingestion rate may be regarded as a parameter for evaluating whether a diet particle is available, recognized, of adequate size, palatable, and preferred by small fish. In this study, we evaluated the effect of food particle size (150–3425 μm) on ingestion rate in juvenile cod (36–826 mg wet weight). Lanthanide oxides were used as markers. Several mixtures of lanthanide marker-labelled diets were produced by combination of the mono-labelled size classes. Each combination was fed for one, four, or seven days to groups of juvenile cod in separate tanks. After termination by anaesthetic, the fish were collected, individually weighed, and frozen until analysis. The amount of lanthanides in the homogenized fish was measured by inductively coupled plasma-mass spectrometry (ICP-MS). There were no significant differences in ingestion of any of the markers when given in a mixture of mono-labelled particles. Thus, the markers Y2O3, La2O3, Nd2O3, Dy2O3, and Yb2O3 may be used as inert tools for evaluating diet ingestion. The total intake of dry diet was about 13 mg g−1 body weight. The particle size that caused the highest food intake was less than 1.2 mm in all experiments.

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Apparent nutrient digestibility, growth performance and feed utilization of juvenile Nile tilapia, Oreochromis niloticus L., as influenced by stocking density and feeding frequency

Emirates Journal of Food and Agriculture ◽

10.9755/ejfa.v12i1.5017 ◽

2004 ◽

Vol 16 (2) ◽

pp. 27

Author(s):

O Yousif

Keyword(s):

Growth Performance ◽

Oreochromis Niloticus ◽

Nile Tilapia ◽

Stocking Density ◽

Feed Utilization ◽

Nutrient Digestibility ◽

Feeding Frequency ◽

Nile Tilapia Oreochromis Niloticus

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Feeding frequency and growth performance of juvenile pink shrimp (Farfantepenaeus paulensis)

Arquivo Brasileiro de Medicina Veterinária e Zootecnia ◽

10.1590/1678-4162-8193 ◽

2015 ◽

Vol 67 (5) ◽

pp. 1415-1420 ◽

Cited By ~ 2

Author(s):

C. S. Pontes ◽

L. C. Marques ◽

E. R. Andreatta ◽

R. S. T. Moura ◽

G. G. Henry-Silva

Keyword(s):

Weight Gain ◽

Growth Performance ◽

Crude Protein ◽

Stocking Density ◽

Negative Influence ◽

Nutrient Leaching ◽

Pink Shrimp ◽

Feeding Frequency ◽

Farfantepenaeus Paulensis ◽

Effect Of Feeding

ABSTRACTIt is generally believed that increasing feeding frequency has immediate benefits, including reduced nutrient leaching and increased shrimp growth. In this context, the aim this work was to evaluate the effect of feeding frequency in growth performance of Farfantepenaeus paulensis. Juveniles of Farfantepenaeus paulensis were grown for 30 days in pen enclosures, at a stocking density of 5 shrimp/m2. The shrimp were fed on feeding trays at a rate of 8% of their biomass per day, with treatments of one, two, three and four times per day, with four replicates each. The results showed no differences (5% probability) in biomass gain of F. paulensis when feed was offered two, three or four times per day. However, it was observed that the once a day frequency had a negative influence on weight gain for this species of shrimp. We conclude that the supply of food with 35% crude protein twice a day is sufficient for the growth of F paulensis. Feeding frequency of three or four times can provide increased spending in the cultivation of juveniles of this species.

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Effects of Stocking Density and FeedingfFrequency on the Growth Performance, Digestive Enzyme Activity, and Tissues Histology of Hybrid Grouper (Epinephelus Fuscoguttatus♀×E. Lanceolatus♂)

10.21203/rs.3.rs-103762/v1 ◽

2020 ◽

Author(s):

Yan Chen ◽

Hai Huang ◽

Jun Ma ◽

Wenkan Liu ◽

Honggan Zhong ◽

...

Keyword(s):

Enzyme Activity ◽

Weight Gain ◽

Growth Performance ◽

Protein Content ◽

Specific Growth ◽

Digestive Enzyme ◽

Stocking Density ◽

Feed Consumption ◽

Digestive Enzyme Activity ◽

Feeding Frequency

Abstract A 6-week 5×2 factorial study was conducted to examine the effects of stocking density and feeding frequency on growth performance, body composition, digestive enzyme activity, and tissue histology of juvenile hybrid groupers raised in an indoor circulating water system. Triplicate groups of fish were reared in tanks following a factorial design consisting of ten treatments including 5 stocking densities (SD) [1.1 kg m−3(0.55 kg fish per tank, SD1.1), 2.2 kg m-3(1.1 kg fish per tank, SD2.2), 3.3 kg m−3(1.65 kg fish per tank, SD3.3), 4.4 kg m−3(2.2 kg fish per tank, SD4.4) and 5.5 kg m−3(2.75 kg fish per tank, SD 5.5)] and 2 feeding frequencies (FF) [3 meals a day (FF3) and 2 meals a day (FF2)]. The resulting 10 treatments were G1(SD1.1,FF3), G2(SD2.2,FF3), G3(SD3.3,FF3), G4(SD4.4,FF3), G5(SD5.5,FF3), G6(SD1.1,FF2), G7(SD2.2, FF2), G8(SD3.3, FF2), G9(SD4.4, FF2) andG10 (SD5.5, FF2). Feed consumption and temperature were recorded throughout the experiment. After 6 weeks, the results indicated that the weight gain rate (WGR) and specific growth rate (SGR) of fish in the G7 group were significantly higher than those of other groups (P< 0.05), followed by G1, with G3 being the lowest. Weight gain and specific growth rates were generally higher in fish fed twice a day than those fed three times a day. The variations in protein content between groups were consistent with the muscle protein content trends. Feeding frequency and stocking density had significant effects on serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), triglycerides (TGs), and cholesterol (CHO) (P < 0.05). Regarding immune function, grouper albumin (ALB), serum lysozyme (LZY), superoxide dismutase (SOD), and alkaline phosphatase (AKP) were significantly affected by stocking density and feeding frequency (P< 0.05). Pepsin and lipase activities in the stomach, intestine, and liver were also affected. The histological structure of the stomach, liver, and intestine in G1, G2, G7, and G8 fish was relatively normal, whereas those of the remaining groups exhibited varying degrees of damage. Overall, the optimum stocking densities were 1.343 kg/m3 (approximately 10 fish) and 2.004 kg/m3 (approximately 20-30 fish) when the fish were fed 3 and 2 times per day, respectively.

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