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Abstract

In the present study, a chlorella-free control diet (C) and five experimental diets supplemented with 0.4~2.0% Chlorella were formulated. The gibel carp (Carassius auratus gibelio), one of the commercial fish in China, were fed with the designed diets for 60 days. At the end of trials, parameters of growth performance, blood and the digestive enzyme were analyzed. The results showed that the optimal dietary level of Chlorella as an additive in gibel carp diet was 0.8~1.2%. The growth performance including RGR, SGR, PER and PDR in 0.8 and 1.2% chlorella-adding group were significantly higher than that of control group (P<0.05). Meanwhile, some blood parameters including total protein, lysozyme in these two groups were also higher than in the control group. Furthermore, the chlorella could increase the digestive enzyme, e.g. amylase, lipase and protease in hepatopancreas and intestine. Our study confirmed that the Chlorella could be used as additive in gibel carp farming and the optimal adding level of Chlorella was 0.8%-1.2%, which could promote the growth performance, immune response and the activity of digestive enzyme.

Evaluation of blood, biochemical and biological effects of microalgae Chlorella and germinated barley powder as a source of prebiotic on common carp Cyprinus carpio L.

“…Chlorella can be considered as a good choice as a supplement and additive for fish diets. Because of high levels of crude protein, it possesses a significant concentration of polysaccharides, lipids, minerals and other bioactive components involved in many physiological activities (9,14).…”

“…The studies on Chlorella utilization in lower vertebrates were less but more focused on human food (9). Nangul and Bhatia (10) found that the high-value biological molecules main source likes polyunsaturated fatty acids, pigments and proteins were algae.…”

Partial replacement of fishmeal with Spirulina platensis and Chlorella vulgaris and its effect on growth and body composition of African catfish Clarias gariepinus (Burchell 1822)

“…In addition, previous studies have attributed the comparable growth performance associated with Chlorella diets, to growth promoters such as sufficient amounts of macro nutrients and Chlorella growth factors, present in C. vulgaris (Yamaguchi, 1996;Badwy et al, 2008). More so, the growth performance associated with dietary Chlorella could be atributed to high digestibility of microalgae and possession of significant concentration of polysaccharides, lipids, minerals and other bioactive compounds involved in physiological activities (Xu et al, 2014;Khani et al, 2017). Khani et al (2017) suggested that Chlorella diets increase the digestive enzymes in the pancreas and intestine of Koi carp, thereby enhancing the diet utilisation rate through increase in the activity of digestive enzymes.…”

“…It also contains Chlorella growth factor (CGF) and β-1, 3-glucan, a strong immune stimulator, a free-radical scavenger as well as a reducer of blood fat (Spolaore et al, 2006). Previously, researchers have investigated Chlorella as a feed additive or fishmeal replacement for growth enhancement and as in immune booster of different fish species such as Gibel carp (Carassius auratus gibelio) (Qihuan et al, 2014;Xu et al, 2014), rohu (Labeo rohita) (Pradhan and Das, 2015), Chlorella and Scenedesmus on Nile tilapia (Oreochromis niloticus) (Badwy et al, 2008).…”

Evaluation of Microalgae as Immunostimulants and Recombinant Vaccines for Diseases Prevention and Control in Aquaculture

“…They found that the addition of 5% dry C. vulgaris powder to koi carp diet can make fish with the highest level of IgM and lysozyme activity, resulting in resistance to both unsuitable environmental conditions and outbreaks of infectious diseases. Xu et al (2014) indicated that when feeding gibel carp Carassius auratus gibelio with C. vulgaris as the dietary additive, with the increase of dietary proportion (0.4-2.0%), the relevant immunological parameters (SOD, POD, LZM, etc.) of gibel carp also showed an increasing trend.…”