Production, Growth, and Insulin‐Like Growth Factor‐I (IGF‐I) Gene Expression as an Instantaneous Growth Indicator in Nile Tilapia<i>Oreochromis Niloticus</i>

Brown, Christopher L.; Cruz, E.M.; Bolivar, Remedios B.; Borski, Russell J.

doi:10.1002/9781118350041.ch3

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…Tilapia are opportunistic feeders that also ingest macrophytes, bacteria and zooplankton, and they have been described as filter feeders because they are capable of removing plankton as small as 5 microns in diameter from the water column and ingesting them [37]. Pond phytoplankton favorably influence the nutritional lipid content of the organisms that consume them, and it is possible that the management of phytoplankton could provide a means of producing specialized tilapia with enhanced fatty acid profiles [43].…”

Section: Tilapia Culture Methods and Feeding Strategiesmentioning

confidence: 99%

The Value of Pig Manure as a Source of Nutrients for Semi-Intensive Culture of Nile Tilapia in Ponds (A Review)

Brown¹,

Yang²,

Fitzsimmons³

et al. 2014

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Growing global needs for food call for substantial increases in protein production in coming years, and for diligent conservation efforts. Manures from farm animals have been viewed both as a resource and as a waste product, but they are critically important sources of nutrients for organic and integrated farming and for traditional Asian aquaculture. Given constraints on livestock production and capture fisheries, careful development of the aquaculture industry is a necessity. The production volume and market share of tilapia are advancing extremely rapidly, and so too is the proliferation of misinformation and controversy. Culture and feeding practices differ widely, but feeding is usually recognized as the single largest cost to producers. Traditional Asian integrated farming practices involve the use of manures and other farm wastes to promote algae and zooplankton production, serving as a sole or supplemental nutrient source to the food chain that supports tilapia growout. Tilapia also ingest manures. The efficient use of nutrients from manures can have multiple benefits to integrated terrestrial agriculture and aquaculture, as long as product safety and quality are not compromised. With efficient use, handling of manures is simplified, fish production costs are reduced, fish nutrition can be improved, and potentially polluting materials are cycled constructively on integrated farms. Consumer and press reactions to the use of farm manures in food production can be highly polarized. Published responses cover a range of extremes, from enthusiastic endorsement to volatile reactions and outright rejection; in some areas this practice is considered to be more of a "PR (Public Relations) problem" than a health hazard. The perception in online public media that tilapia coming from ponds fertilized with manure are * Corresponding author. C. L. Brown et al. 1183 heavily contaminated with pathogens has not been supported by evidence. The perspectives of farmers in two major tilapia production areas (China and the Philippines) are included.

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Section: Tilapia Culture Methods and Feeding Strategiesmentioning

confidence: 99%

The Value of Pig Manure as a Source of Nutrients for Semi-Intensive Culture of Nile Tilapia in Ponds (A Review)

Brown¹,

Yang²,

Fitzsimmons³

et al. 2014

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“…This small difference indicated high correlation among WG%, SGR and hepatic IGF-I expression of GIFT tilapia juveniles. However, Brown et al (2012) reported that IGF-I gene directly stimulates the growth hormones, thus expression of this gene is a specific molecular marker for assessing growth performance of the animal including fish.…”

Section: O N L I N E C O P Ymentioning

confidence: 99%

Optimal dietary protein requirement of juvenile GIFT Tilapia (Oreochromis niloticus) reared in inland ground saline water

Paul¹,

Sardar²,

Sahu³

et al. 2022

JEB

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Aim: The present study was conducted to optimize the dietary protein level in the diet of Genetically Improved Farmed Tilapia reared in inland ground saline water (IGSW) of 15 ppt ambient salinity. Methodology: Seven iso-caloric (400 kcal digestible energy, DE/100g), iso-lipidic (6%) and hetero-nitrogenous (20-50% crude protein, CP) purified diets were prepared for conducting the feeding trial. Following completely randomized design, the random distribution of 315 acclimatized fish (average body weight 4.01±0.01g) was made in seven groups namely, CP20, CP25, CP30, CP35, CP40, CP45 and CP50 in triplicate with the stocking density of 15 fish per replicate tank. Results: Weight gain percentage, specific growth rate, and expression of insulin like growth factor-I and insulin like growth factor-I receptor with higher quadratic relation (R2=0.94, 0.96, 0.90 and 0.93, respectively) to the dietary crude protein (CP) level significantly increased (p<0.05) up to 40% crude protein and beyond that the values significantly decreased. With higher quadratic (R2=0.83) relation, muscle RNA/DNA ratio was significantly highest in 40% crude protein fed group. With higher quadratic (R2=0.81 and 0.98, respectively) relations, significantly higher protease and lower amylase activities were found in 40, 45 and 50% crude protein fed groups. Interpretation: Second order polynomial regression analysis based on WG%, SGR and IGF-I gene expression revealed that the optimum dietary protein for GIFT juveniles could be 41.84, 40.66 and 42.22%, respectively. This data will be helpful for development of economic and environment-friendly feed for GIFT tilapia culture in inland ground saline water of medium salinity.

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“…In humans, IGF-1 levels are associated with body mass index and fat deposits in adult women [38]. In addition, the IGF-1 gene is widely used in agriculture as a potential biomarker [39,40].…”

Section: Introductionmentioning

confidence: 99%

Growth Patterns and Growth-Axis Gene Expressions in Sexual Dimorphism of Silurus asotus Linnaeus, 1758

Qiao

et al. 2023

Journal of Applied Ichthyology

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Aquaculture has tremendous economic significance in distinguishing males and females in the juvenile Silurus asotus (Linnaeus, 1758) to obtain a female population with tremendous growth potential. To investigate the potential biological markers between young males and females S. asotus, we analyzed the characteristics of sexual dimorphism by measuring the 14 length traits and 9 weight indicators in an artificial insemination population at 3, 5, and 7 months. In addition, quantitative real-time PCR (qRT-PCR) was performed to determine the sexually dimorphic expression of the growth hormone-1 gene (GH-1), growth hormone receptor gene (GHR), and insulin-like growth factor gene (IGF-1) in the hypothalamus, pituitary, gonad, and liver, at 3, 5, and 7 months. The results showed that in morphology, except for eye diameter and the distance between the pelvic and anal fins in 3-month fish, all other morphological indicators were significantly ( P < 0.05 ) or very significantly ( P < 0.01 ) different between juvenile males and females. The visceral weight, eviscerated weight, and intestine weight in females were significantly ( P < 0.05 ) or very significantly ( P < 0.01 ) higher than in males at 5 and 7 months. Joint static allometric analyses on 14 length indicators relative to weight showed different sex growth patterns in 3-month, 5-month, and 7-month fish. In gene expression patterns, GH-1, IGF-1, and GHR were highly expressed in the pituitary, with higher levels in females ( P < 0.05 or P < 0.01 ). In contrast, the three genes were all more highly expressed in the testis than in the ovary ( P < 0.01 ), indicating their essential roles in testis development. Our results demonstrate that S. asotus has female-biased sexual dimorphism. The length traits related to head shapes could be the potential phenotype marker to distinguish females and males in 7-month juveniles.

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Production, Growth, and Insulin‐Like Growth Factor‐I (IGF‐I) Gene Expression as an Instantaneous Growth Indicator in Nile TilapiaOreochromis Niloticus

Cited by 5 publications

References 27 publications

The Value of Pig Manure as a Source of Nutrients for Semi-Intensive Culture of Nile Tilapia in Ponds (A Review)

The Value of Pig Manure as a Source of Nutrients for Semi-Intensive Culture of Nile Tilapia in Ponds (A Review)

Optimal dietary protein requirement of juvenile GIFT Tilapia (Oreochromis niloticus) reared in inland ground saline water

Growth Patterns and Growth-Axis Gene Expressions in Sexual Dimorphism of Silurus asotus Linnaeus, 1758

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