An assessment of morphometric indices, blood chemistry variables and an energy meter as indicators of the whole body lipid content in Micropterus dolomieu , Sander vitreus and Ictalurus punctatus

2014 ◽  
Vol 86 (2) ◽  
pp. 755-764 ◽  
Author(s):  
M. G. Mesa ◽  
B. P. Rose
Keyword(s):  
Lipid Content ◽  
Ictalurus Punctatus ◽  
Blood Chemistry ◽  
Whole Body ◽  
Sander Vitreus ◽  
Micropterus Dolomieu ◽  
Body Lipid ◽  
Energy Meter

scholarly journals Utility of Condition Indices as Predictors of Lipid Content in Slimy Sculpin (Cottus cognatus)

Diversity ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 71 ◽  
Author(s):  
Hards ◽  
Gray ◽  
Noël ◽  
Cunjak
Keyword(s):  
Lipid Content ◽  
Condition Factor ◽  
Whole Body ◽  
Moderate Degree ◽  
Body Lipid ◽  
Indirect Measurements ◽  
Cottus Cognatus ◽  
Slimy Sculpin ◽  
Relative Condition Factor ◽  
Condition Indices

Slimy sculpin (Cottus cognatus) are increasingly being used as indicator species. This has primarily entailed measuring their condition, the assumption being that condition can be used as a surrogate for lipid content. While there is evidence to suggest this assumption is applicable to some fish, it has yet to be validated for C. cognatus. Further, there are several means by which one may calculate condition, the most commonly employed of which are indirect measurements of lipid content (namely, Fulton's K, somatic K (Ks), and Le Cren's relative condition factor (Kn)). We compared the ability of each of these morphometric indices to predict whole-body lipid content in C. cognatus. There was a moderate degree of evidence that Fulton's K, Ks, and Kn are reliable predictors (Ks and Kn in particular). Of the latter we recommend Kn be used because, unlike Ks, it does not require that fish be killed. And while Fulton's K did not perform quite as well, we consider it a sufficient substitute if the data necessary to calculate Kn are unavailable.

Influence of Age and Season on Whole-Body Lipid Content of Plathypena scabra (Lepidoptera: Noctuidae)

1990 ◽  
Vol 19 (5) ◽  
pp. 1259-1262 ◽  
Author(s):  
L. J. Mason ◽  
S. J. Johnson ◽  
J. P. Woodring
Keyword(s):  
Lipid Content ◽  
Whole Body ◽  
Body Lipid ◽  
Lepidoptera Noctuidae

Calibration of a rapid non-lethal method to measure energetic status of a freshwater fish (Murray cod, Maccullochella peelii peelii)

2010 ◽  
Vol 61 (5) ◽  
pp. 527 ◽  
Author(s):  
Nick S. Whiterod
Keyword(s):  
Energy Density ◽  
Water Content ◽  
Freshwater Fish ◽  
Lipid Content ◽  
Average Energy ◽  
Whole Body ◽  
Energy Meter ◽  
Species Specific ◽  
Murray Cod ◽  
Body Energy

The energetic status of freshwater fish provides a dynamic measure of their energy balance in response to the environment they occupy. Commercially available microwave technology (the ‘energy meter’) provides a rapid, non-lethal and inexpensive alternative to traditional laboratory methods for the determination of energy density. The energy meter requires species-specific confirmation of the water–lipid relationship, and comparison of energy meter readings with laboratory-determined estimates of the whole-body energy density. I explored the applicability of the energy meter to the threatened Murray cod (Maccullochella peelii peelii), using both hatchery and wild individuals. Although hatchery and wild fish varied in lipid content, water content and energy density, the parameter comparisons necessary to calibrate the energy meter were statistically consistent between both groups. Subsequently, a robust combined water–lipid relationship was identified for Murray cod, where energy density was strongly related to both water content and lipid content. Average energy meter readings were capable of providing a rapid, non-lethal and accurate assessment of Murray cod energy density. The successful calibration highlights the applicability of the energy meter to provide a dynamic measure of the energetic status of threatened freshwater fish throughout the world.

Is gonadal investment in walleye (Sander vitreus) dependent on body lipid reserves? A multipopulation comparative analysis

2008 ◽  
Vol 65 (4) ◽  
pp. 600-614 ◽  
Author(s):  
Matthew D Moles ◽  
Thomas A Johnston ◽  
Beren W Robinson ◽  
William C Leggett ◽  
John M Casselman
Keyword(s):  
Egg Size ◽  
Reproductive Effort ◽  
Reproductive Traits ◽  
Whole Body ◽  
Sander Vitreus ◽  
Lipid Concentration ◽  
Body Lipid ◽  
Lipid Contents ◽  
Nutrient Reserves

A key requirement of effective fisheries management is a better understanding of the mechanisms driving recruitment variability. Recent research suggests that the quantity and quality of gametes produced by fish is closely linked to the availability of surplus energy, usually stored as lipid. We sampled mature walleye (Sander vitreus) from seven populations across Canada to determine if indices of reproductive effort were positively related to indices of adult nutrient reserves, primarily body lipid concentration. Populations varied greatly in growth rates, body lipid contents, and reproductive traits. Within-population trends between indices of reproductive effort and parental body traits were highly variable. Body lipid concentration was most closely related to gonad lipid concentration, but not in all populations. Among populations, relative fecundity and ovary lipid concentrations were positively related, and egg size was negatively related to whole-body lipid concentrations; no trends were evident for males. Our results suggest that relationships between walleye reproductive effort and body lipid reserves may be more complex than previously thought.

scholarly journals Low-Lipid Diets Fed at Reduced Ration: Effects on Growth, Body Composition, and Survival of Juvenile Chinook Salmon

2019 ◽  
Vol 10 (2) ◽  
pp. 500-508
Author(s):  
Karen M. Cogliati ◽  
Julia R. Unrein ◽  
Wendy M. Sealey ◽  
Frederic T. Barrows ◽  
Olivia Hakanson ◽  
...  
Keyword(s):  
Body Composition ◽  
Lipid Content ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Whole Body ◽  
Body Lipid ◽  
Daily Growth ◽  
Commercial Diet ◽  
High Lipid ◽  
Lipid Diet

Abstract There is a growing demand within research and conservation hatcheries to rear fish that more closely approximate the smaller size and leaner body composition of their wild counterparts. Low-lipid diets may help achieve this goal as they can provide all the nutritional needs of young fish and can lead to slower growth and leaner bodies. We compared growth of Chinook Salmon Oncorhynchus tshawytscha fed three experimental low-lipid diets (11–12, 8–9, 4–6% lipid) at the onset of feeding with a commercially available high-lipid diet (18–20%) and an experimentally formulated high-lipid control (13.9% lipid). After 5 mo on their respective treatments, the size, growth rate, and daily growth index of fish on the commercial diet were significantly higher than those on the three low-lipid diets. We also compared whole-body lipid content across our five diet treatments. Whole-body lipid content was significantly different across the five diets, with fish fed the commercial diet having, on average, an almost twofold higher lipid content over fish fed the lowest lipid diet formulation. We present comparable data from a limited sample of wild juvenile conspecifics as observations. We suggest that low-lipid starter diets can be used to produce healthy fish that more likely emulate some of the variations in size and body composition of wild fish.

scholarly journals In vivo measurement of total body lipid content of common carp (<i>Cyprinus carpio</i> L.) by electrical conductivity

2003 ◽  
Vol 46 (4) ◽  
pp. 397-402 ◽  
Author(s):  
C. Hancz ◽  
G. Milisits ◽  
P. Horn
Keyword(s):  
Electrical Conductivity ◽  
Lean Body Mass ◽  
Body Mass ◽  
Common Carp ◽  
Lipid Content ◽  
Live Weight ◽  
Fat Content ◽  
Whole Body ◽  
Body Lipid ◽  
Total Body

Abstract. non-destructive method to predict the total lipid content and the lean body mass (LBM) was evaluated by measuring the total body electrical conductivity (TOBEC) with common carp. This technique is based on the principle that body fat and fat-free mass differ in electric properties which can be measured in a low-frequency electromagnetic field. Experimental fish with average body weight of 1225 ± 298 g originated from a commercial stock. Fish were slaughtered immediately after the measurements and homogenized samples were taken from the grinded whole-body. The fat content of the homogenates was analysed using Soxhlet extraction after hydrochloric acid digestion. The weight of lean body mass (LBM) was calculated as the difference between the live weight and the weight of fat determined. The TOBEC method provided very precise estimation of lean body mass (R2 = 0.99). Total body lipid content (in gram) can also be predicted from the E value and live weight with adequate accuracy (R2 = 0.66) in the size range of 706–1989 g in common carp. The predictibility of the crude fat content (in %) was moderate (R2 = 0.37) in the present investigation. It could not be increased significantly by including other body measurements as standard lenght, height and circumference. Fat content of table-sized, sexually matured common carp can be estimated at a precision level that may be adequate only if high selection pressure has to be applied in a breeding program.

Effect of body lipid content is linked to nutritional adaptation in the acclimation responses of mesic-adapted Paederus to seasonal variations in desiccation stress

2021 ◽  
Vol 131 ◽  
pp. 104226
Author(s):  
Lee-Jin Bong ◽  
Chia-Yu Wang ◽  
Satomi Shiodera ◽  
Takashi F. Haraguchi ◽  
Masayuki Itoh ◽  
...  
Keyword(s):  
Lipid Content ◽  
Seasonal Variations ◽  
Desiccation Stress ◽  
Body Lipid
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