Effect on pigmentation, growth and liver histopathology of red pepper (Capsicum annuum) added in different ratios to jewel cichlid (Hemichromis guttatus) diet

Abstract

Ornamental fish farming is one of the most popular hobbies in the world. The pigmentation of ornamental fish may be an important factor affecting its market value and may also directly indicate its healthiness and quality. In nature, the fish meet their carotenoid requirements by ingesting aquatic plants or through their food chains. Fish cannot fully synthesize their own carotenoid colourings so these must be included in their diet. Synthetic carotenoid sources are widely used as supplements in fish diets for desired skin colorations. However, their usage is limited due to the high price of synthetic colourings. In addition, there is increasing consumer awareness about environmental impacts and safety of synthetic pigments. Therefore, natural compounds supplementation containing carotenoid is needed to enhance colour perfor-

The potential of a combination of pungent spices as a novel supplement in gilthead seabream (Sparus aurata) diets to aid in the strategic use of fish oil in aquafeeds: a holistic perspective

“…( 20 ) when supplementing gilthead seabream diets with 0.1% and 0.15% of this additive during winter. While none of the aforementioned studies testing the effect of capsicum in fish diets described an amelioration of FCR ( 56 , 58 – 60 ), some of the works with black pepper or ginger and many of those with cinnamaldehyde supplementation did ( 63 , 65 , 66 , 68 , 70 , 72 , 74 , 75 ). Therefore, the decrease in FCR in fish fed the SPICY 0.1% diet might be partly attributed to the active principles of ginger and black pepper and to cinnamaldehyde or to the synergetic effect of the four spices present in the tested product.…”

“…Nonetheless, the effects of capsicum, black pepper, and ginger (or their active principles) have been separately assessed on fish performance, with controversial results (Supplementary Table S12). In this sense, some studies have reported that the dietary inclusion of capsicum did not lead to a significant improvement in BW nor SGR in gilthead seabream, blue streak hap (Labidochromis caeruleus), Mozambique tilapia (Oreochromis mossambicus), rainbow trout (Oncorhynchus mykiss), and jewel cichlid (Hemichromis guttatus) (56)(57)(58)(59)(60). On the other hand, Talebi et al (61) showed that the dietary supplementation of red bell pepper (Capsicum annum) at an inclusion level of 44 or 55 mg/kg for 20-60 days significantly increased the BW and total length, but not the SGR in rainbow trout (Oncorhynchus mykiss).…”

The effects of Capsicum annuum oleoresin, as a dietary carotenoid, on growth, gut microbiome, intestinal histomorphometry, and sensory characteristics of Oncorhynchus mykiss

“…Scabini et al (2011) also informed that increasing the dietary inclusion of paprika oleoresin enhanced the reproductive functionality of seabream. Latterly, it was found that dietary inclusion of 3% C. annuum improved the growth and induced good coloration without negatively affecting the overall health conditions of jewel cichlid (Yigit et al, 2021). To our knowledge, no studies were found to investigate the gut microbiome, intestinal histomorphometry, and sensory criteria of fish fed with CAO‐supplemented feeds.…”