Environmental effects on feed utilization

Kaushik, Sadasivam

doi:10.1007/bf02264081

Cited by 19 publications

(7 citation statements)

References 61 publications

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“…However, this increase seems only partially linked to a positive influence of sexual maturation through steroid circulating levels, as in LL fish, a 58 % increase in muscle lipid content was observed in maturing males and females while a smaller increase (35%) was observed in nonmaturing fish. Aside from hormonal factors, external factors such as an increase in temperature may be involved by acting on nutriment utilization and digestibility (Kaushik, 1986). On the other hand, visceral fat values were Comment citer ce document : Weil, C., Lefèvre, F., Bugeon, J.…”

Section: Modulation Of Adiposity By Intrinsic Factorsmentioning

confidence: 99%

Characteristics and metabolism of different adipose tissues in fish

Weil

Lefèvre

Bugeon

2012

Rev Fish Biol Fisheries

138

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Lipids are the predominant source of energy for fish and are stored in fat depots in different parts of the body regions. This review focuses on visceral, subcutaneous and intramuscular adipose tissues that interfere with carcass and fillet yields and with flesh quality. The morphological, cellular and biochemical characteristics of these tissues are discussed as well as the different mechanisms involved in the regulation of their lipid metabolism. Particular emphasis is given to the modulation of these characteristics and mechanisms by different extrinsic (food composition, water parameters) and intrinsic (selective breeding, life cycle status) factors. This review focuses on recent studies that take into account the present challenges of fin-fish aquaculture, which are principally (1) the replacement of fish oil and meal by vegetable oil and meal due to the need for sustainability and the limited availability of fish to prepare food pellets, and (2) selective breeding programs to improve fish growth and flesh quality. These studies apply various modern technologies to different fish species, including the development of cell culture systems and transcriptomic and proteomic techniques. This review highlights that fish adipose tissues differ in their localization and their morphological characteristics and that they show a large plasticity in their responses to variations of both extrinsic and intrinsic factors. These different responses reinforce the idea of their differential participation in fish lipid homeostasis

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Section: Modulation Of Adiposity By Intrinsic Factorsmentioning

confidence: 99%

Characteristics and metabolism of different adipose tissues in fish

Weil

Lefèvre

Bugeon

2012

Rev Fish Biol Fisheries

138

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“…As poikilothermic aquatic animals, the temperature is a key environmental factor for abalone, greatly infuencing physiological functions related to feed intake, metabolism, and growth [26,27]. Improved abalone growth performance and survival in response to increasing temperature has been established previously in diferent abalone species [12,16,28].…”

Section: Introductionmentioning

confidence: 97%

Optimal Dietary Protein Requirement of Subadult Australian Hybrid Abalone (Haliotis rubra × Haliotis laevigata) at Different Rearing Temperatures

Hassan

Mock

Searle

et al. 2023

Aquaculture Research

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Australian abalone aquaculture is characterised by a prolonged culture period and slow and variable growth, and abalone is cultured in fluctuating water temperatures ranging between 10 and 25°C with distinct seasons. Temperature is a crucial environmental factor influencing abalone’s physiology and energetics, leading to a change in nutritional requirements. However, feeds are generally formulated to match the nutritional requirements at their optimal temperature. Hence, there is a need to optimise dietary protein levels to match temperature-specific requirements during extreme conditions (winter and summer). Given this, a growth trial evaluating five experimental feeds consisting of graded protein inclusion levels (320, 350, 380, 410, and 440 g·kg−1) was conducted on subadult hybrid abalone (Haliotis rubra × H. laevigata) at three different temperatures reflecting winter (12°C), summer (22°C), and the annual average water temperature (17°C) for 143 days. At lower water temperature (12°C), there was a marginal improvement in growth performance as dietary protein levels increased from 320 to 440 g·kg−1. However, at higher water temperatures (when the culture water temperature is above 17°C), there was a significant improvement in growth performance as dietary protein levels increased from 320 to 440 g·kg−1 as evidenced by an improved weight gain, specific growth rate, and feed conversion ratio. Furthermore, increasing dietary protein levels did not compromise the nutritional quality of the abalone tissue at all three tested temperatures. Therefore, during periods of higher water temperatures, feeding Australian hybrid abalone with a relatively high dietary protein level (410 g·kg−1) is expected to result in improved growth, shorter culture duration, and profit maximisation.

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“…It is known that fish growth increased with increasing temperature up to the optimum, and then decreased as the temperature rose toward the upper thermal limits (Brett 1979;Kroll et al 1992;Jobling 1994;Koskela et al 1997). The higher temperature below the optimum may have enhanced the growth rate by increasing the food intake, nutrient digestion, absorption, and metabolism of the fish (Wedemeyer 1973;Hofer 1979;Elliott 1982;Groot et al 1983;Kaushik 1986). Although food intake was not measured in this study, more uneaten feed was observed in the 18ЊC tank than in the 22ЊC and 26ЊC tanks.…”

Section: Discussionmentioning

confidence: 99%

Effect of Diets and Water Temperatures on Growth Performance of Splittail Larvae

Deng

Teh

Hung

2002

North American Journal of Aquaculture

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A 4‐week growth trial using a 4 × 3 × 2 factorial design (consisting of four diets, three water temperatures, and two replications of 150 larvae each) was conducted with splittail Pogonichthys macrolepidotus larvae (16 d posthatch, weighing 3.1 ± 0.5 mg [mean ± SE] and measuring 8.9 ± 0.2 mm) in three recirculation systems. The four diets were three commercial feeds (Silver Cup [SC], BioDiet [BD], and Biokyowa [BK]) and a laboratory purified‐casein (PC) diet. The three water temperatures were 18, 22, and 26°C. Results indicated that the specific growth rate, total body length, condition factor, and whole body moisture of the fish were significantly (P < 0.05) affected by the diets and water temperatures, whereas mortality was only affected by the diets. The interaction of diet and water temperature was significant for the specific growth rate, total body length, whole body moisture, and mortality but not for the condition factor. Larvae fed the BK and PC diets had a higher specific growth rate and lower mortality than those fed the SC and BD diets at all temperatures. Larvae raised at 26°C grew faster and were thus significantly longer and heavier than those raised at 18°C. These results suggest that the BK or laboratory PC diet and a water temperature of 26°C were better than the other commercial feeds and water temperatures for splittail larvae under our laboratory conditions.

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Environmental effects on feed utilization

Cited by 19 publications

References 61 publications

Characteristics and metabolism of different adipose tissues in fish

Characteristics and metabolism of different adipose tissues in fish

Optimal Dietary Protein Requirement of Subadult Australian Hybrid Abalone (Haliotis rubra × Haliotis laevigata) at Different Rearing Temperatures

Effect of Diets and Water Temperatures on Growth Performance of Splittail Larvae

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