Effect of herbal additives on the growth, survival and disease resistance in black molly, poecilia sphenops (Val.)
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Date
2012
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Publisher
CCSHAU
Abstract
Ornamental fishe trade earns foreign exchange besides serving as a source of employment.
Diseases are a crucial factor which inhibits the expansion of aquaculture. Moreover, the bacterial infections
are considered the major cause of mortality in aquaculture. Use of herb plants in aquaculture is gaining
success. Recently it is considered as an alternative to antibiotics, chemicals in fish health management. The
present investigation was designed for a period of six weeks to study the influence of herbal additives on
the growth, diseases resistance and survival in black molly, Poecilia sphenops.
From diseased fish black molly (Poecilia sphenops) six bacterial strains were isolated and
identified. The herbal extract of Ocimum sanctum (Tulsi), Withania somnifera (Ashwagandha), Aloe vera
(aloe) and Emblica officinalis were tested to find out there antibacterial properties against isolated bacteria
under in in vitro condition. All herbal extract showed inhibitory effect against pathogenic bacteria, but
Emblica officinalis extract was most effective among all herbal extract. Future studies were conducted to
test the efficacy and potential of most suitable herb extract (Emblica officinalis) under in vivo conditions.
Fish fed with herbal extract (Emblica officinalis) in different concentration (@1, 1.5 and 2% of feed
ingredients) gave better results in terms of hematological parameters, growth and percent survival rate as
compare to control group. Level of Hb, TEC, TLC and PCV was highest in fish fed with Emblica
officinalis diet @ 1.5% followed by Emblica officinalis diet @ 1%, 2% of feed and then control group.
Emblica officinalis extract @ 1.5% of feed yield highest mean weight (4.23g) and length (3.62cm) gain.
The highest survival rate (95.8%) was also observed in Emblica officinalis fed group at 1.5 per cent
concentration. Hence the alternative herbal biomedicines prove to be very effective in aqua-cultural
operations.
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Keywords
Bacteria, Biological phenomena, Extraction, Diseases, Biological development, Pathogens, Fruits, Aloe, Irrigation, Polysaccharides