Use and misuse of a common growth metric: guidance for appropriately calculating and reporting specific growth rate

Crane, Derek P.; Ogle, Derek H.; Shoup, Daniel E.

doi:10.1111/raq.12396

Cited by 41 publications

(40 citation statements)

References 28 publications

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“…Afterward, the instantaneous growth rate (IGR), specific growth rate (SGR), weight gain rate (WGR), feed conversion ratio (FCR), protein efficiency ratio (PER), condition factor (ConF), feed intake (FI), survival rate (SR) were calculated via the following formulas ( Crane et al, 2020 ):

…”

Section: Methodsmentioning

confidence: 99%

Replacing Dietary Fish Meal with Defatted Black Soldier Fly (Hermetia illucens) Larvae Meal Affected Growth, Digestive Physiology and Muscle Quality of Tongue Sole (Cynoglossus semilaevis)

et al. 2022

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For solving the global shortage of fish meal (FM) supplies from fisheries, the black soldier fly (Hermetia illucens) has become a new protein alternative in aquatic feeds. The present study investigated the effects of dietary inclusion of defatted H. illucens larvae meal (DBLM) on growth, serum biochemical parameters, digestive function, and muscle quality of tongue sole (Cynoglossus semilaevis). The feeding experiment consisted of five experimental diets: a control diet based on FM protein (H0) and four DBLM diets, substituting 25% (H25), 50% (H50), 75% (H75), and 100% (H100) of FM. C. semilaevis (initial weight 563.48 ± 22.81 g) were randomly allocated over five treatments in quadruplicate. After 65 days of feeding, the weight gain rate (WGR), specific growth rate (SGR), and protein efficiency ratio (PER) were significantly higher in H0 and H25 groups with less feed conversion ratio (FCR) and feed intake (FI). The concentrations of serum ALT, TG, T-CHO, ALB, and GLO and their ratio (i.e., A/G) in the H25 group were also significantly higher than those in the other DBLM diet-feeding groups. The digestive enzyme activities first increased (from 25% to 75%) and then decreased (from 75%) with the increased level of DBLM in diets. Meanwhile, there were significant improvements in the thickness of the intestinal longitudinal muscle (LM), circular muscle (CM), columnar epithelium (CE), and lamina propria (LP) in H25 C. semilaevis compared to the control group (p < 0.05). The fish from the other DBLM diets groups presented significant reductions in the thicknesses of LM, CM, CE, and LP, as well as the length of microvilli (ML) in a dose-dependent manner (p < 0.05). However, the substitution of FM increased up to 50% would result in intestinal structural damage. Moreover, the proximate compositions, antioxidant and water holding capacity, and muscular structures of C. semilaevis fillets were all significantly affected after substituting 25% FM with DBLM (p < 0.05). Except for the dry matter, moisture, ash, crude fat, and protein contents were significantly higher in H25 C. semilaevis muscles. The SOD activity in the H0 group was significantly lower than that in the H25 group. The CAT activity in C. semilaevis muscles prominently reduced along with the increase in DBLM content in feeding diets (p < 0.05). The water holding capacity of C. semilaevis fillets was best in the H25 group. In summary, the optimum proportion of DBLM with FM for feeding C. semilaevis may be around 25%.

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…”

Section: Methodsmentioning

confidence: 99%

Replacing Dietary Fish Meal with Defatted Black Soldier Fly (Hermetia illucens) Larvae Meal Affected Growth, Digestive Physiology and Muscle Quality of Tongue Sole (Cynoglossus semilaevis)

et al. 2022

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“…Notably, the term specific growth rate (SGR) is widely used in fishery literature. However, reports show that the most used formula cannot be interpreted as a per cent change in weight per unit of time and may be somewhat misleading [13,21,22]. In order to make comparisons with previously reported research, we still examined the parameter and expressed its value as SGR 2 .…”

Section: Growth Performance Experimentsmentioning

confidence: 99%

Predator-Prey Interactions between Nonnative Juvenile Largemouth Bass (Micropterus salmoides) and Local Candidate Prey Species in the Pearl River Delta: Predation Capacity, Preference and Growth Performance

Luo

Yang

2022

Life

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An ontogenetic dietary shift is crucial for the survival and growth of piscivorous largemouth bass (LB). However, there is much to learn about the predator-prey interaction during the switching process. We carried out a series of indoor experiments to examine the predation capacity, predation preference, and growth performance of exotic juvenile LB feeding on candidate prey species in the Pearl River Delta. The widely distributed oriental river prawn (Macrobranchium nipponense), barcheek goby (Ctenogobius giurinus), western mosquitofish (Gambusia affinis), silver carp (Hypophthalmichthys molitrix), and mud carp (Cirrhinus molitorella), with relatively similar total lengths, were selected as potential prey based on their availability and habitat use. Our results show that predation capacity and preference varied quantitatively and qualitatively among prey species. The number of oriental river prawns killed was significantly less than that of fish species, comparing the 1st hour with the 24th hour (p < 0.01). The feeding rhythm of LB varied significantly from crayfish to fish. Numerically, Jacobs’ selection index reinforced LB’s special preference for predating G. affinis. Although there were obvious variations in predation capacity and feed selection, no statistically significant growth differences were detected among LB groups feeding on live M. nipponense, G. affinis, H. molitrix, and C. molitorella (p < 0.05). These findings suggest that the successful ontogenetic dietary shift of juvenile LB may depend on the availability and vulnerability of local fish species. Further study on the reproductive phenology of potential fish prey may help to predict LB’s establishment.

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“…, where w 1 and w 2 are weights at t 1 and t 2 , respectively, and Δt is t 2 -t 1 (Crane et al, 2020) The premix contains 3.5 × 10…”

Section: Determination Of Growth Performance Of Tilapiamentioning

confidence: 99%

Effects of water extracts of American cockroach ( Periplaneta americana ) on the growth and physiological and biochemical indices of genetically improved farmed tilapia ( Oreochromis niloticus )

Zhang

Luo

et al. 2022

Aquaculture Research

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New antioxidants as antibiotic substitutes are urgently required in aquaculture as their liver protection and anti-inflammatory effects. To explore the potential value of American cockroach (Periplaneta americana) powder water extract (ACPWE) as an antioxidant substitute for genetically improved farmed tilapia (GIFT, Oreochromis niloticus), different concentrations of ACPWE were added to the GIFT feed and its effects on growth performance, foregut histologic morphology, and some biochemical indices were measured. ACPWE had no significant effect on GIFT weight gain, feed conversion, specific growth rates, or condition factors. The viscerosomatic index of GIFT exposed to ACPWE was lower, indicating that ACPWE reduced the GIFT visceral mass. ACPWE had no significant effect on the length and width of foregut villi.At ACPWE concentrations >1.5 g/kg, serum aspartate aminotransferase (AST) and alanine aminotransferase, and liver AST concentrations decreased, whereas serum and liver total protein concentrations, catalase, total superoxide dismutase, and glutathione peroxidase activities, and total antioxidant capacity increased. Based on the observed serum and liver biochemical and antioxidant indices, adding 1.5 g/kg ACPWE to feed could improve GIFT antioxidant ability.

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Use and misuse of a common growth metric: guidance for appropriately calculating and reporting specific growth rate

Cited by 41 publications

References 28 publications

Replacing Dietary Fish Meal with Defatted Black Soldier Fly (Hermetia illucens) Larvae Meal Affected Growth, Digestive Physiology and Muscle Quality of Tongue Sole (Cynoglossus semilaevis)

Replacing Dietary Fish Meal with Defatted Black Soldier Fly (Hermetia illucens) Larvae Meal Affected Growth, Digestive Physiology and Muscle Quality of Tongue Sole (Cynoglossus semilaevis)

Predator-Prey Interactions between Nonnative Juvenile Largemouth Bass (Micropterus salmoides) and Local Candidate Prey Species in the Pearl River Delta: Predation Capacity, Preference and Growth Performance

Effects of water extracts of American cockroach ( Periplaneta americana ) on the growth and physiological and biochemical indices of genetically improved farmed tilapia ( Oreochromis niloticus )

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