Page 25 - Vol.39-No.8 issue

FISHERIES

DIGESTIVE AND METABOLIC ENHANCER OFFSETS

REDUCED CHOLESTEROL LEVEL IN SHRIMP FEED

Global fishmeal and fish oil prices are, addition of LIPOGEST® improved the
to a large extent, linked to the supply sit- growth compared to the negative con-
uation in South America (Peru and Chile) trol and restored the performance of the
and demand from Asia (primarily China). shrimp to the same level as that of the feed
Currently, Peru is the largest source of with higher cholesterol levels. FCR of the
fishmeal (FM) and fish oil (FO) output LIPOGEST® treatment was similar to that
and also the world’s largest producer and ment in shrimp feeds. One of the solutions of the feed with higher cholesterol levels.
exporter of FM and FO. An unsuccessful is Lipogest®, a digestibility and metabol- Such improvements can be attributed to
season in Peru might cause as much as a ic enhancer based on bile salts. Bile salts a more optimal digestion efficiency and
20% decrease in global output. Impact- constitute an alternative source for the regulation of cholesterol metabolism. In
ed by El Niño, Peru has recently canceled steroid ring and, therefore, can maintain the this line, Lin et al. (2017) demonstrated
the first fishing season for anchovy in the synthesis of molting hormones in situations the significant effects of adding bile salts in
north-central zone, creating new challeng- where cholesterol levels are deficient in the cholesterol-deficient soybean mealbased
es for the global market of FM and FO. diet (Lin et al., 2017). Furthermore, bile diets for white shrimp.
salts improve the digestive capacity for
Impact on essential lipids lipids in the digestive system of shrimp by Furthermore, this study showed that
Cholesterol is an essential nutrient for improving lipid emulsification and micelle several ecdysteroid signaling response
genes, such as the expression of ecdys-
shrimp. It is a key compound of membranes formation, resulting in faster absorption teroid receptor, chitin synthetase and
and a precursor for the synthesis of ecdys- of lipids in the hepatopancreas. muscle growth markers, were improved
teroid molting hormones. Reducing FM and Shrimp trial by adding bile salts in cholesterol-deficient
FO in shrimp feeds will directly affect the diets. In a more recent trial, the supple-
level and availability of essential lipids such A feeding trial with white shrimp (Li- mentation of bile acids at 0.025-0.1% in
as n-3 HUFA, phospholipids and cholester- topenaeus vannamei) demonstrated the 14% FM shrimp feeds reduced the FCR and
ol. Cholesterol requirement studies show effective replacement of FO and purified increased weight gain (Wang et al. 2023).
a wide range of cholesterol requirements cholesterol with LIPOGEST®. As shown in Altogether, these results show that bile salt
from 0.5 to 5 g/kg for L. vannamei (Chen, Table 1, the positive control feed (CHOL8) supplementation can mitigate the adverse
1993; Duerr & Walsh, 1996; Gong et al., was formulated to reach an optimal choles- effects of cholesterol deficiency caused by
2000). Practical shrimp diets are usually terol level of 0.08%. The negative control low FM inclusion.
formulated with cholesterol levels starting feed (CHOL6) was formulated at a choles-
from 0.07-0.1%. Lower levels than 0.07% terol level of 0.06% by lowering the fish Conclusion In conclusion, within the
are considered insufficient. Purified choles- oil and by omitting the purified cholesterol current context of high prices of FM, FO
terol can also be added to reach a targeted compared to the positive control diet. To and cholesterol, aquafeed formulators can
level. These sources are, however, becom- this diet, 0.125% bile salt-based LIPO- count on LIPOGEST® to make aquafeeds
ing very expensive, therefore, requiring GEST® was added and compared to CHOL8 perform with less marine lipids and cho-
more cost-effective alternative options. in an eight-week feeding trial. lesterol and, therefore, achieve significant
cost-reductions without losing the per-
In times of high FM and FO prices, it is Reducing the level of cholesterol sig- formance and metabolic activities related
important for nutritionists to search for nificantly affected growth and feed con- to dietary cholesterol.
strategies to fulfill the cholesterol require- version in white shrimp. However, the

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HOW AI-ENHANCED CAMERAS ARE

TRANSFORMING DEEP FARMING

artificial intelligence, opening up camera technology, seamlessly integrating
more possibilities for a sustainable into AKVA group's digital arsenal.
future. The camera, AKVA submerged, are
“This partnership enables us to create well-suited for the deep farming con-
a versatile camera system that effectively cept Nautilus, a submersible net system
addresses crucial areas such as lice con- that provides optimal conditions for fish
trol, biomass management, fish health, and by avoiding surface disturbances and lice
AKVA group and Submerged part- welfare,” says Director Digital Business De- attacks. Traditionally, the aquaculture in-
nership is set to kickstart a new era velopment Ana Maria Moris Valdebenito dustry has relied on manual monitoring
in deep farming. As AI seamlessly at AKVA group. and control processes, which are both
integrates with advanced camera time-consuming and often imprecise. The
technology, fish farmers can antic- AKVA group recently acquired a 51% advent of AI presents a shift in this sector,
ipate more precise, efficient, and ownership stake in Submerged. This strate- enabling fish farmers to leverage data-driv-
sustainable practices. The future of gic partnership fuses the potential of artifi- en tools that can handle vast amounts of
aquaculture is moving deeper into cial intelligence with advanced underwater information in real-time.

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