Cross Type Research Articles

Genotype responsive growth performance and salinity tolerance of tilapia hybrid (Oreochromis niloticus × O. mossambicus)

The unstable salinity level in the coast forced the aquaculture practice in saline conditions. The inherent genetic qualities of tilapia, one of the major contributors to aquaculture production worldwide, help domesticate easily in a diverse set of aquatic conditions. A set of pre-selected (genotypes of a specific marker) males (m) and females (f) from both Oreochromis niloticus (N) and O. mossambicus (M) were kept inside hapas with a 1:1 ratio for interspecific hybridization, O. niloticus × O. mossambicus. Four progenies of the interspecific hybrid, one of traditional intraspecific and one more of the unknown intraspecific genotypic progenies (F1) were considered to detect the superiority of growth and survival induced by salinity in relation to allelic sensitivity. Collected progenies from different cross combinations with two replications each were reared for comparing growth inside hapa within an earthen pond for 60 days. Survival probabilities were tested under salinity stress (gradual incline up to 30 ppt and then decline to freshwater condition by 22 days) inside plastic drums. Stocking similarities were followed and weight-defined feeding was applied. Similar growth was observed between intraspecific Nf × Nm offsprings and interspecific Mf × Nm progenies but the reciprocal of the interspecific cross (Nf × Mm) progenies demonstrated an inferior growth rate in the freshwater earthen pond (inside hapa). Among interspecific crosses: F1 hybrids of female M homozygous for the short allele (PrlLK_254/254) and male N homozygous for the long allele (PrlLK_281/281) showed superior growth performance while the F1 hybrid between female M homozygous for short (PrlLK_254/254) and male N homozygous for short allele (PrlLK_254/254) showed menial. Moreover, the F1 progenies produced by crossing homozygous short females M with homozygous long and heterozygous (long/short) showed superior growth compared to those produced by crossing with homozygous short males of N. On the other hand, F1 progeny produced by crossing homozygous short males of M with females of N (homozygous long) showed a comparatively inferior growth rate. Mf_254/254 × Nm_281/254 and Mf_254/254 × Nm_281/281 offspring displayed interaction effects with other groups. No mortality was recorded until 15 ppt and during the declining phase from 30 ppt to freshwater condition. By different cross types and sexes, the survival probabilities were not significantly different. Interspecific hybrids with homozygous alleles (either long or short) showed total survival probability whereas the heterozygous parent demonstrated the most awful survivability with significant dissimilarity (p = 0.04). Because the shorter allele is responsible for better survival inside higher salinity and the longer is for higher growth in freshwater; the selection of the parental group depending on marker assistant allelic segregation could propose a pertinent protocol in the coastal region.

Fast hyperbolic wavelet regression meets ANOVA

We use hyperbolic wavelet regression for the fast reconstruction of high-dimensional functions having only low dimensional variable interactions. Compactly supported periodic Chui–Wang wavelets are used for the tensorized hyperbolic wavelet basis. In a first step we give a self-contained characterization of tensor product Sobolev–Besov spaces on the d-torus with arbitrary smoothness in terms of the decay of such wavelet coefficients. In the second part we perform and analyze scattered-data approximation using a hyperbolic cross type truncation of the basis expansion for the associated least squares method. The corresponding system matrix is sparse due to the compact support of the wavelets, which leads to a significant acceleration of the matrix vector multiplication. In case of i.i.d. samples we can even bound the approximation error with high probability by loosing only log -terms that do not depend on d compared to the best approximation. In addition, if the function has low effective dimension (i.e. only interactions of few variables), we qualitatively determine the variable interactions and omit ANOVA terms with low variance in a second step in order to increase the accuracy. This allows us to suggest an adapted model for the approximation. Numerical results show the efficiency of the proposed method.

Online professional development across institutions and borders

Professional development (PD) is a key element for enhancing the quality of academic teaching. An increasing number of PD activities have moved to blended and online formats, especially since the COVID-19 pandemic. Due to the desire, potential, and need for collaboration among educators to learn from innovative and best practices, several institutions have started to pool their resources and expertise together and have started to implement cross-institutional and cross-national online professional development (OPD). The questions of what type of a (cross-)institutional OPD educators might prefer, and whether educators learn effectively from (and with) peers in such cross-cultural context have not been adequately explored empirically. In this case-study across three European countries, we explored the lived experiences of 86 educators as a result of a cross-institutional OPD. Using a mixed methods design approach our pre-post findings indicated that, on average, participants made substantial gains in knowledge. In addition, several cultural differences were evident in the expectations and lived experiences in ODP, as well as the intention to transfer what had been learned into one's own practice of action. This study indicates that while substantial economic and pedagogical affordances are provided with cross-institutional OPD, cultural differences in context might impact the extent to which educators implement lessons learned from OPD.

Motion characteristics and residence time of particles in the new cross structure under constant-pulse condition

The residence time of particles in the flow field is highly sensitive to the fluid’s flow characteristics and the particles’ motion. We proposed a dynamic entry mode with the constant-pulse (CP) condition in response to the conditions of symmetric impinging streams and asymmetric impinging streams. Single-particle motion behaviors and particle residence time in a novel cross-type structure reactor we designed were studied and discussed in this article. This was done by looking at how these variables changed depending on the impulse inlet velocity conditions, the reactor geometry, and the particle properties. The results demonstrate that when particle relaxation time is short, those particles without oscillatory motions were directly accelerated to leave the active area. When its relaxation time is reasonably set, even a single particle can hugely elevate the oscillatory motions. With the structure of the novel cross type, the particle merely exhibits three oscillatory under the condition of the symmetric pulse inlet flow and asymmetric pulse inlet flow, notwithstanding, CP contains at least three oscillatory motions. The t tot is the duration that an individual particle spends in the working region. The t tot and active area were affected by inlet velocity, parameters of particles and the shape of the reactor parameters of particles and the shape of the reactor. The t tot raised with τ* increased in a certain range. T is the inlet velocity variation period. The particle resides time at T = T b reaches a maximum in the CP. The maximum residence times T b was affected by particle relaxation time, under CP with a diameter ratio of 5 and inlet velocity difference of 0.8. The particle retention time in the novel cross-type structure reactor was heightened by 7 times. The CP and the novel cross-type structure reactor can improve the retention time of particles in the flow field.

Hydrodynamic effects in kinetics of phase separation in binary fluids: Critical versus off-critical compositions.

Via hydrodynamics-preserving molecular dynamics simulations we study growth phenomena in a phase-separating symmetric binary mixture model. We quench high-temperature homogeneous configurations to state points inside the miscibility gap, for various mixture compositions. For compositions at the symmetric or critical value we capture the rapid linear viscous hydrodynamic growth due to advective transport of material through tubelike interconnected domains. For state points very close to any of the branches of the coexistence curve, the growth in the system, following nucleation of disconnected droplets of the minority species, occurs via a coalescence mechanism. Using state-of-the-art techniques, we have identified that these droplets, between collisions, exhibit diffusive motion. The value of the exponent for the power-law growth, related to this diffusive coalescence mechanism, has been estimated. While the exponent nicely agrees with that for the growth via the well-known Lifshitz-Slyozov particle diffusion mechanism, the amplitude is stronger. For the intermediate compositions we observe initial rapid growth that matches the expectations for viscous or inertial hydrodynamic pictures. However, at later times these types of growth cross over to the exponent that is decided by the diffusive coalescence mechanism.

Automatic Detection of Pedestrian Crosswalk with Faster R-CNN and YOLOv7

Autonomous vehicles have gained popularity in recent years, but they are still not compatible with other vulnerable components of the traffic system, including pedestrians, bicyclists, motorcyclists, and occupants of smaller vehicles such as passenger cars. This incompatibility leads to reduced system performance and undermines traffic safety and comfort. To address this issue, the authors considered pedestrian crosswalks where vehicles, pedestrians, and micro-mobility vehicles collide at right angles in an urban road network. These road sections are areas where vulnerable people encounter vehicles perpendicularly. In order to prevent accidents in these areas, it is planned to introduce a warning system for vehicles and pedestrians. This procedure consists of multi-stage activities by sending warnings to drivers, disabled individuals, and pedestrians with phone addiction simultaneously. This collective autonomy is expected to reduce the number of accidents drastically. The aim of this paper is the automatic detection of a pedestrian crosswalk in an urban road network, designed from both pedestrian and vehicle perspectives. Faster R-CNN (R101-FPN and X101-FPN) and YOLOv7 network models were used in the analytical process of a dataset collected by the authors. Based on the detection performance comparison between both models, YOLOv7 accuracy was 98.6%, while the accuracy for Faster R-CNN was 98.29%. For the detection of different types of pedestrian crossings, YOLOv7 gave better prediction results than Faster R-CNN, although quite similar results were obtained.

Evaluation of the mechanical properties of current biliary self-expandable metallic stents: axial and radial force, and axial force zero border.

Mechanical properties (MPs) and axial and radial force (AF and RF) may influence the efficacy and complications of self-expandable metallic stent (SEMS) placement. We measured the MPs of various SEMSs and examined their influence on the SEMS clinical ability. We evaluated the MPs of 29 types of 10-mm SEMSs. RF was measured using a conventional measurement device. AF was measured using the conventional and new methods, and the correlation between the methods was evaluated. A high correlation in AFs was observed, as measured by the new and conventional manual methods. AF and RF scatterplots divided the SEMSs into three subgroups according to structure: hook-and-cross-type (low AF and RF), cross-type (high AF and low RF), and laser-cut-type (intermediate AF and high RF). The hook-and-cross-type had the largest axial force zero border (>20°), followed by the laser-cut and cross types. MPs were related to stent structure. Hook-and-cross-type SEMSs had a low AF and high axial force zero border and were considered safest because they caused minimal stress on the biliary wall. However, the increase in RF must be overcome.

Teenagers Indulgement in Drug: A Study on Different Socio-Economic Groups in Urban and Rural Bangladesh

Abstract: Objective: To find out the causes, level of knowledge and sources of drugs among drug addicted teen agers. Materials & Methods: It was cross sectional mixed method type of study conducted at different shelter homes at Dhaka and Mymensingh from January 2022 to November 2022. Study population were the teen agers, age 14-19 years old patients admitted to the shelter homes. Data was collected by face to face interview with pretested structured and unstructured questionnaire. Results: Majority of the respondent 41.2% was between the age group 17 & 18 and 73%^ were college going. 51.3% of the respondent were from a family with 43 people. Majority 57.2% father’s education was graduate level and mothers 34.8% were secondary or equitable passed. 41.7% father was service holder and majority 69.51% of the mother was housewives. Mean family income was 63320.86  27362.44. Maximum teen agers 43.85% believe drugs increases the joy of life and 90% of the respondent knowledge regarding different sides of drug abuse is poor. Conclusion: The study revealed that teen agers knowledge regarding different sides of drug abuse is poor. Different government, non-government organization, traditional social control agencies, law enforcement organizations and research in intervention program about different aspect of drugs indulgent need to be done to increase knowledge level of teen agers against drug addiction.

Exploring the diversity of sexual systems and pollination in Brazilian Cleomaceae species

The family Cleomaceae is characterized by remarkable floral diversity and abundant nectar and pollen production. In this study, we evaluated the flower functional characteristics associated with the floral diversity of 10 Cleomaceae species, in addition to respectively seven and five accessions of Tarenaya hassleriana and T. longicarpa. The flowers were examined through five types of crosses and thus we determined the most efficient type of crossing based on the number of seeds. In addition, we evaluated pollen limitation, self-incompatibility, self-pollination and explored the possible effects on seed germination. The species can be grouped into three groups based on sexual systems: andromonoecious, hermaphroditism (chasmogamous and cleistogamous), and polygamomonoecious flowers. Gynandropsis gynandra, T. aculeata, T. diffusa, and T. microcarpa exhibited autogamy, whereas the other species did not. Overall, hand cross-pollination produced the highest seed yield, followed by open pollination. Self-pollination produced the lowest number of seeds, with no seed production noted in 16 accessions. Interestingly, the pollination type did not affect seed germination. Together, these results indicate the potential of the Cleomaceae family as a source of information regarding mechanisms involved in the determination of reproductive traits in plants.

The Dynamic Ontogenetic Shape Patterns of Adaptive Divergence and Sexual Dimorphism

The interplay between ecological diversification and sexual dimorphism has been largely overlooked in the literature. Sexually dimorphic species which are also undergoing adaptive radiations are ideal for filling this knowledge gap. The Arctic charr in lake Thingvallavatn is one such system: it is a sexually dimorphic species which has recently diverged along the benthic-limnetic ecological axis. In a long-running common-garden experiment we studied the shape variation throughout ontogeny of intra- and inter- morph crosses of benthic and limnetic charr from the lake. We found that shape differences between ecomorphs and sexes had a genetic component. Prior to the onset of sexual maturation, shape differences were attributable to cross type and were related to adaptations to benthic and limnetic niches, i.e., shorter lower jaws and rounder snouts in the benthic and evenly protruding snouts and pointier snouts in the limnetic. Reciprocal hybrids showed intermediate, transgressive and/or maternal morphologies. However, after the onset of sexual maturation larger morphological differences occurred between sexes than among cross types. Taken together, our results demonstrate that the interplay between ecological diversification and sexual dimorphism is complex and dynamic throughout ontogeny, and that long-term common garden experiments are immensely valuable for studying shape dynamics in different evolutionary scenarios.

Reproductive isolating mechanisms contributing to asymmetric hybridization in Killifishes (Fundulus spp.).

When species hybridize, one F1 hybrid cross type often predominates. Such asymmetry can arise from differences in a variety of reproductive barriers, but the relative roles and concordance of pre-mating, post-mating prezygotic, and post-zygotic barriers in producing these biases in natural animal populations have not been widely investigated. Here, we study a population of predominantly F1 hybrids between two killifish species (Fundulus heteroclitus and F. diaphanus) in which >95% of F1 hybrids have F. diaphanus mothers and F. heteroclitus fathers (D♀ × H♂). To determine why F. heteroclitus × F. diaphanus F1 hybrids (H♀ × D♂) are so rare, we tested for asymmetry in pre-mating reproductive barriers (female preference and male aggression) at a common salinity (10ppt) and post-mating, pre-zygotic (fertilization success) and post-zygotic (embryonic development time and hatching success) reproductive barriers at a range of ecologically relevant salinities (0, 5, 10, and 15 ppt). We found that F. heteroclitus females preferred conspecific males, whereas F. diaphanus females did not, matching the observed cross bias in the wild. Naturally rare H♀ × D♂ crosses also had lower fertilization success than all other cross types, and a lower hatching success than the prevalent D♀ × H♂ crosses at the salinity found in the hybrid zone centre (10ppt). Furthermore, the naturally predominant D♀ × H♂ crosses had a higher hatching success than F. diaphanus crosses at 10ppt, which may further increase their relative abundance. The present study suggests that a combination of incomplete mating, post-mating pre-zygotic and post-zygotic reproductive isolating mechanisms act in concert to produce hybrid asymmetry in this system.

Genome Size, Flowering, and Breeding Compatibility in Osmanthus Accessions

Extending the range of Osmanthus species into more cold-hardy climates would open new opportunities for adoption and use of these species by growers, landscapers, and the public. Breeding improvement is hindered by few available cultivars and a lack of female or perfect flowers. The objectives of this study were to evaluate floral morphology and pollination biology of Osmanthus species available in the U.S. market. Thirty-three genotypes representing four species were evaluated in McMinnville, TN, USA for genome size, floral morphology, pollen viability, and self- and cross-compatibility. All genotypes were diploid with 2C genome sizes ranging from 2.89 to 3.21 pg. Perfect flowers were observed in all O. armatus and 82% of O. heterophyllus genotypes. All observed O. fortunei and O. fragrans genotypes had male-only flowers. Pollen viability based on staining and in vitro germination ranged from 8% to 98% and 6% to 53%, respectively. Pollen germination was observed on stigmas of 94.2% of O. armatus and O. heterophyllus flowers collected 24 hours after cross- or self-pollination. There was a significant association between cross type and percentage of flowers with pollen tubes reaching the ovaries; after 72 h, pollen tubes had reached the ovaries of in 67% of intraspecific crosses, 78% of interspecific crosses, and 0% of self crosses (χ2 = 26.5, p < 0.001). This study provides evidence of a self-incompatibility system in O. armatus and O. heterophyllus and provides insights into opportunities and challenges for Osmanthus hybrid breeding.

Discussion of St. Brigid’s Cross as a Complex Symbol

The discussion of St. Brigid’s cross as a complex symbol intends to illustrate the rich cultural implication of St. Brigid’s Cross. Beginning with St. Brigid and St. Brigid’s Day, the essay firstly introduces the importance of this day. Then it continues to demonstrate the strictly regulated process of making one proper St. Brigid’s cross, with some variations included. The straw, the main material to make crosses, has the implication of securing fertility, which is also noted in the essay. Types of cross are generally introduced with pictures for reference. At last, the cross’s cultural implications – to protect and to ensure fertility are addressed in detail.

Experimental comparison of changes in relative survival and fitness-related traits of wild, farm, and hybrid Atlantic salmon Salmo salar in nature

Farming of Atlantic salmon Salmo salar has resulted in highly domesticated individuals, with notable genetic and phenotypic differences from their wild counterparts. Understanding how interbreeding with aquaculture escapees affects wild, often at-risk populations is increasingly essential to conservation efforts. Here, we used an experimental release of wild, farm, and reciprocal F1 hybrid fry at 3 sites in the Garnish River in Newfoundland, Canada, to evaluate family and cross-specific patterns of recapture/survival, size, sex ratio, and precocial male maturation over a 28 mo period. Trends in cross type recapture changed over the study period, with the highest recapture at 3 mo in parr with wild mothers and between 15 and 28 mo in aquaculture offspring. Size trends among crosses and sites remained consistent over the study duration, with pure farm and wild-mother hybrids being consistently larger than wild individuals and 1 site displaying elevated sizes in all crosses. Rates of parr maturation differed by sex and cross type, and family-based analysis indicated family representation and size also remained consistent through time. These results indicate there is a difference in vital rates such as survival and precocial maturation between farm and wild Atlantic salmon during the freshwater early life history period, and this difference can change significantly over time. As such, an improved understanding of genetic and ecological interactions which takes this ontogenetic variation into account is likely essential to fully understand how hybridization and introgression with farm escapees are affecting wild populations.

Double-diffusive stagnation point flow over a vertical surface with thermal radiation: Assisting and opposing flows.

In numerous industrial procedures, the main concern of design engineers is ensuring adequate heat and mass transfer, such as in the heating and cooling practices of solar water heaters, geothermal systems, extrusion of metal, insulation of buildings, electronics, turbines, aerodynamics, electronics, paper manufacturing, and glass fiber production. The unsteady double-diffusive mixed convection flow of boundary layer nanofluids above a vertical region near stagnation point flow is developed and examined here. The Brownian motion and thermophoresis effects are incorporated by using Buongiorno's model. In the thermal energy equations, diffusion of regular and cross types is also used. By the use of the local similarity method along with suitable similarity transformations, nonlinear unsteady partial differential equations are converted to nonlinear ordinary differential equations and are numerically solved by the Keller-Box method. The investigation expresses that these profiles of solute concentration and nanoparticle concentration, temperature, and velocity in their boundary layers, respectively, depending on several parameters. A graphic analysis of all these parameters' possessions on nature's boundary layers is depicted. The highest rate of heat transfer is obtained with negligible thermophoresis effect. Furthermore, it is perceived that an increase in Nc and Nt results in a reduction in the reduced Sherwood number of nanoparticles, whereas addition results in an increase in the Nb number. There is a reverse effect on the temperature field and layer thickness for heat generation. In the wake of the above-mentioned potential applications, the current study of fluid flow has been found to be very interesting and innovative in the analysis of the influence of Brownian motion and thermophoresis effects near stagnation point flow, which will further make revolutions in industrial fields. Moreover, Buongiorno's model predicts the characteristics of double-diffusive fluids in enhancing heat transfers. This investigation has been established as a result of the numerous industrial applications mentioned above.

ОСОБЕННОСТИ АНАЛИЗА АВАРИЙНОСТИ С УЧАСТИЕМ ПЕШЕХОДОВ НА ТЕРРИТОРИИ БЕЛГОРОДСКОЙ ОБЛАСТИ

A detailed analysis of traffic accidents involving pedestrians for 2018-2022 was made. in the Belgorod region. The distribution of collisions with pedestrians was revealed by days of the week, by months, by the place of the incident, by the types of pedestrian crossings. The main offenses of drivers and pedestrians are indicated, as a result of which a traffic accident occurs. Listed preventive organizational and technical measures to improve the safety of pedestrians.

The correlation of psychiatric symptoms and the perception of Oppel-Kundt illusion with cross type distractor

The correlation of psychiatric symptoms and the perception of Oppel-Kundt illusion with cross type distractor

Ареалы распространения некоторых типов нательных крестов XVII—XIX веков по данным из Государственного каталога музейного фонда Российской Федерации

This article is the first nation-wide attempt to study an issue of localization of certain types of body crosses in the Russian archaeology. The source base of the study is represented by 5,465 body crosses originating from 78 regions of the Russian Federation. The localization of 20 different types of body crosses is reviewed. It was determined that 16 of them have a dense geographical localization. The results obtained allow concluding that the data from the State Catalogue of the Museum Fund of the Russian Federation, as a whole, correctly reflects the cultural and historical phenomena of the past. The manufacturing centers for most types of crosses were established. The migration directions of groups of people with certain types of crosses were revealed. It is proposed to identify crosses with such morphological and/or iconographic features, which have limited geographical localization, as typological units, as this allows moving from a formal record-oriented classification to an informative one, that is, one that reflects the cultural and historical phenomena of the past.

Новые находки нательных крестов на территории исторической Алании

Introduction. In the period from the 10th to the beginning of the 13th centuries on the territory of historical Alania (the east of Krasnodar Krai – the northern regions of Chechnya), the Christian church flourished. The material evidence of religious life in this territory is the data of staurography – namely, the finds of reliquary crosses, pectoral crosses, quadrifolia. The choice of the subject of personal piety was determined not only by the assortment of local craft workshops and the directions of trade relations, but also by the taste and capabilities of each person. Therefore, the study of this category of finds makes the historical and social portrait of the early Christians of the North Caucasus more prominent. Methods. As a result of the baptism of the Alans in the 10th century and the establishment of the Alan Diocese with its center in Nizhny Arkhyz (914), crosses of Byzantine provincial and ancient Russian origin are becoming widespread on the territory of Alania. With the spread of Christianity, imitative and imitation types of crosses appear in the local Alan environment, the finds of which have not yet been found outside the Caucasus. To date, there are more than 120 crosses-encolpia, pectoral crosses and quadrifolia of the 12th – 13th centuries known on the territory of historical Alania. In this regard, the discovery of each new cross is of outstanding interest. Analysis. Currently, to the body of crosses originating from the territory of Alania, we can add the finds of four more interesting specimens found in recent years in the eastern regions of Krasnodar Krai, the Karachay-Cherkessia Republic, the south of Stavropol Krai, and the north of the Chechen Republic. The first cross is the front leaf of the reliquary cross with the image of the Crucifixion, dates from the 11th – 12th centuries and belongs to the Byzantine crosses of the Balkan (?) origin. Such crosses are quite common, being one of the first in Old Rus, made by visiting craftsmen. The second cross – the reverse leaf of the reliquary cross with the image of the Virgin the Sign. Only two similar instances are known. These crosses were made by local (or visiting) craftsmen in Alania according to numerous Byzantine samples and date back to the 12th century. The third cross is one-sided, with the image of an unknown saint (St. Nicholas?). Crosses of a similar shape are known, but with the image of the Crucifixion. These crosses were made in the local, Alan environment and date back to the 12th – 13th centuries. The fourth cross is one-sided, silvered, with the image of the Crucifixion. As analogies, seven one-sided crosses identical in shape and composition from the territory of the Northern and Western Pre-Caucasus are given. In Alania, these crosses were in use from the middle or the second half of the 10th century to the turn of the 11th – 12th centuries. Different versions of the image of Christ are explained by the presence of several local workshops, as well as different craft and artistic traditions. Results. The presented finds of crosses not only add to the evidence of the Christianization of Alania in the 11th – 12th centuries, but also provide valuable information about the nature of the local, imitative Byzantine originals of the production of objects of personal piety.

Differences in energy acquisition and storage of farm, wild, and hybrid Atlantic salmon competing in the wild

An understanding of genetic differences in fitness-related traits for farm, wild, and hybrid Atlantic salmon ( Salmo salar) is key for predicting impacts of aquaculture escapes on wild populations. Here we used lipid and fatty acid (FA) analyses to investigate differences in storage and foraging ability among Atlantic salmon juveniles of three cross types (farm, wild, and F1 hybrids), at the beginning and end of a common garden experimental release in the Newfoundland wild. We found differences in lipid class and FA profiles among cross types at both release and recapture, with farm fish being the most differentiated at recapture. In addition, low recapture levels of triacylglycerols and certain FAs indicative of freshwater prey suggest the possibility of a feeding disadvantage for farm fish. Overall, we show that lipid and FA profiles in juvenile salmon can change over just a short period of time even under favourable conditions in the wild, and farm fish may have genetic differences affecting energy acquisition and storage that could negatively impact their survival and fitness in the longer term.