Individual differences in territory and growth of ayu, Plecoglossus altivelis (Osmeridae)

1996 ◽  
Vol 74 (12) ◽  
pp. 2170-2177 ◽  
Author(s):  
Osamu Katano ◽  
Kei'ichiroh Iguchi
Keyword(s):  
Growth Rate ◽  
Factor Analysis ◽  
Individual Differences ◽  
Social Organization ◽  
Fish Growth ◽  
Foraging Success ◽  
Plecoglossus Altivelis ◽  
Aggressive Interactions ◽  
Natural Streams ◽  
Territory Formation

We observed 10 categories of behaviour in 133 ayu, Plecoglossus altivelis, kept individually in isolated aquaria, and separated three individuality components, aggressiveness, activity, and slow reaction, by factor analysis. We then divided 84 of the fish into 14 groups, each comprising 6 individuals, and released each group into one of four ponds designed to simulate natural streams for a 10-day period to investigate their territory formation and growth rates. Individuals that showed aggression towards an ayu model in the aquaria tended to engage in many aggressive interactions with other individuals in the ponds. Large and active individuals from the aquaria were dominant over other individuals in the ponds. The increase in aggressive interactions and percentage of encounters won increased the territorial period of individual fish. Growth rate was significantly correlated with territorial period, indicating that individual differences were important in social organization and individual foraging success.

The Structure Among Measures of Personality, Social Attitudes, Values, and Social Norms

2007 ◽  
Vol 28 (4) ◽  
pp. 240-251 ◽  
Author(s):  
Lazar Stankov
Keyword(s):  
Factor Analysis ◽  
Individual Differences ◽  
Social Norms ◽  
Social Interactions ◽  
Correlation Matrix ◽  
Social Attitudes ◽  
Group Differences ◽  
Factor Scores ◽  
Ethnic Group Differences ◽  
Inside Out

Abstract. This paper presents the results of a study that employed measures of personality, social attitudes, values, and social norms that have been the focus of recent research in individual differences. These measures were given to a sample of participants (N = 1,255) who were enrolled at 25 US colleges and universities. Factor analysis of the correlation matrix produced four factors. Three of these factors corresponded to the domains of Personality/Amoral Social Attitudes, Values, and Social Norms; one factor, Conservatism, cut across the domains. Cognitive ability showed negative correlation with conservatism and amoral social attitudes. The study also examined gender and ethnic group differences on factor scores. The overall interpretation of the findings is consistent with the inside-out view of human social interactions.

TOWARDS THE QUESTION OF SPECIALIZED FEEDS FOR TENCHES (TINCA TINCA)

2017 ◽  
pp. 89-97
Author(s):  
Elena Mikhaylovna Chervonenko ◽  
Lina Yurievna Lagutkina
Keyword(s):  
Growth Rate ◽  
Fish Growth ◽  
Animal Origin ◽  
State Technical ◽  
Tinca Tinca ◽  
Daily Growth ◽  
Volga River ◽  
The Moment ◽  
First Time ◽  
Technical Centre

The article describes the process of tench growing (male and female species removed from set gear in the Volga river in the Astrakhan region) using experimental feedstuff "T", taking into account the fact that problems with artificial growing tench ( Тinca tinca ) appear first in the process of feeding when wild sires change to artificial food. The research took place on the base of the department of aquaculture and water bioresources of Astrakhan State Technical University in innovation centre "Bioaquapark - scientific and technical centre of aquaculture" in 2015. Special feed including components of animal origin - mosquito grab and sludge worm as an effective substitute to fish flour, as well as components of vegetable origin (carrot, parsley, pumpkin, wheatgrass) for domestication of tenches are offered for the first time. Food technology has been described. The exact composition of the formula, which is being licensed at the moment, is not disclosed. Feed "T", which has undergone biological analysis and is in accordance with organoleptic and physical standards was used for feeding tench female and male species during domestication period (60 days), along with food "Coppens" (Holland). Feed efficiency was determined according to survival and daily fish growth. Growth rate of females appeared more intensive than growth rate of males fed with experimental food "T". Daily growth changed depending on the types of food: from 0.3 ("Coppens") to 0.47 (experimental food) in females, from 0.25 ("Coppens") to 0.39 (experimental food) with males. Ability to survive among tench species fed with "Coppens" and experimental food made 60% and 100%, correspondingly. Nutricion of tench species with experimental food encouraged their domestication, which allowed using tench species in further fish breeding process in order to get offspring. The project was supported by the Innovation Promotion Fund in terms of the project "Development and implementation of the technique for the steady development of aquaculture: food "TechSA".

Homesickness: a comparative study of defense and civilian employees and individual differences

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Naval Garg ◽  
B.K. Punia ◽  
Vanshikha Kakkar ◽  
Sarika Kumari
Keyword(s):  
Factor Analysis ◽  
Individual Differences ◽  
Design Methodology ◽  
Nuclear Family ◽  
Family Type ◽  
Adjustment Problems ◽  
Content Type ◽  
Five Dimensions ◽  
Confirmatory Factor ◽  
Civilian Employees

Purpose Most of the studies in the field of homesickness are confined to students; this study aims to explore the feeling of homesickness among working professionals. Also, it tends to examine individual differences in the experience of homesickness across employees of different gender, ages, experience, family type, etc. The study also aspires to compare homesickness among military and civil employees. Design/methodology/approach The study explores five dimensions of homesickness, namely, missing family, missing friend, rumination about home, feeling lonely and adjustment problems. The collected data is subjected to reliability, validity and confirmatory factor analysis. Further, t-test and analysis of variance are used to explore homesickness differences across soldiers and corporate employees. Findings The study reveals that homesickness is significantly higher for employees in the male, unmarried, nuclear family, above the age of 45 years, and below the graduation category. Also, defense people experience more homesickness than civilian employees. Originality/value This study is one of the pioneer studies that compare homesickness among defense and civilian employees. Also, variables such as type of family, the experience of employees and marital status have hardly been explored in the literature of homesickness.

scholarly journals PERTUMBUHAN DAN SINTASAN HIDUP IKAN NILA DENGAN PENAMBAHAN TEPUNG WORI (Ormocarpum cochinchinense) FERMENTASI DALAM PAKAN

2021 ◽  
Vol 7 (2) ◽  
pp. 1-6
Author(s):  
Numisye Iske Mose ◽  
Jetti Treslah Saselah
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Fish Growth ◽  
Utilization Efficiency ◽  
Fish Feed ◽  
Randomized Design ◽  
Leaf Powder ◽  
Feed Utilization Efficiency

Tanaman wori merupakan salah satu tanaman kelompok fabaceace yang tumbuh melimpah di Sangihe dan sangat potensial digunakan sebagai salah satu sumber pakan ikan. Kadar protein daun wori adalah 25,53% sehingga berpotensi menjadi protein nabati bagi ikan. Kendala utama yang ditemui ketika memanfaatkan daun tanaman wori adalah kandungan karbohidrat yang tinggi yaitu 48,51% sehingga dapat mempengaruhi proses pencernaan ikan, penyerapan nutrisi yang berujung pada rendahnya pertumbuhan ikan. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh tepung daun wori femerntasi terhadap laju pertumbuhan spesifik dan sintasan hidup ikan nila. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL). Perlakuan yang dilakukan terdiri dari tiga perlakuan dan tiga kali ulangan yaitu kadar tepung daun wori tanpa fermentasi A (kontrol) 10%, kemudian B tepung daun wori fermentasi (10%), dan C tepung daun wori fermentasi (20%). Laju pertumbuhan spesifik dan efisiensi pakan diuji menggunakan ANOVA sedangkan sintasan hidup akan dianalisis secara deskriptif. Hasil penelitian ini menunjukan bahwa penambahan tepung wori fermenasi dalam pakan dapat meningkatkan nilai laju pertumbuhan spesfik ikan nila dan efisiensi pemanfaatan pakan dengan nilai tertinggi pada perlakuan C yaitu SGR 1,94%/hari. Sementara itu, untuk semua perlakuan nilai sintasan hidup sebesar 100%.   The wori plant is one of the plants of the fabaceace group that grows abundantly in Sangihe and has potential to be used as a source of fish feed. The protein content of wori leaves is 25.53%, so it has the potential to become vegetable protein for fish. The main obstacle encountered when utilizing wori plant leaves is the high carbohydrate content of 48.51% so that it can affect the digestion process of fish, nutrient absorption which lead to low fish growth. The purpose of this study was to determine the effect of wori femerntation leaf meal on the specific growth rate and survival of tilapia. The experimental design used was a completely randomized design (CRD). The treatments consisted of three treatments and three replications, namely the content of fermented wori leaf powder, A (control) 10%, then B fermented wori leaf powder (10%), and C fermented wori leaf powder (20%). Specific growth rate and feed efficiency were tested using ANOVA, while survival rate was analyzed descriptively. The results of this study indicate that the addition of fermented wori powder in the feed can increase the value of the specific growth rate of tilapia and feed utilization efficiency with the highest value in treatment C, namely SGR 1.94% / day. Meanwhile, for all treatments the survival rate was 100%.

scholarly journals Individual Differences in the Tendency to See the Expected

2020 ◽  
Author(s):  
Nora Andermane ◽  
Jenny Bosten ◽  
Anil Seth ◽  
Jamie Ward
Keyword(s):  
Factor Analysis ◽  
Individual Differences ◽  
Binocular Rivalry ◽  
Attentional Control ◽  
Visual Awareness ◽  
Facilitatory Effect ◽  
Strong Signal ◽  
Perceptual Anomalies ◽  
Perceptual Abilities ◽  
Attentional Mechanism

Prior knowledge has been shown to facilitate the incorporation of visual stimuli into awareness. We adopted an individual differences approach to explore whether a tendency to ‘see the expected’ is general or method-specific. We administered a binocular rivalry task and manipulated selective attention, as well as induced expectations via predictive context, self-generated imagery, expectancy cues, and perceptual priming. Most prior manipulations led to a facilitated awareness of the biased percept in binocular rivalry, whereas strong signal primes led to a suppressed awareness, i.e., adaptation. Correlations and factor analysis revealed that the facilitatory effect of priors on visual awareness is closely related to attentional control. We also investigated whether expectation-based biases predict perceptual abilities. Adaptation to strong primes predicted improved naturalistic change detection and the facilitatory effect of weak primes predicted the experience of perceptual anomalies. Taken together, our results indicate that the facilitatory effect of priors may be underpinned by an attentional mechanism but the tendency to ‘see the expected’ is method-specific.

Consistent patterns of maturity and density-dependent growth among populations of walleye (Sander vitreus): application of the growing degree-day metric

2010 ◽  
Vol 67 (7) ◽  
pp. 1057-1067 ◽  
Author(s):  
Paul A. Venturelli ◽  
Nigel P. Lester ◽  
Terry R. Marshall ◽  
Brian J. Shuter
Keyword(s):  
Growth Rate ◽  
Explanatory Power ◽  
Management Strategies ◽  
Fold Increase ◽  
Fish Growth ◽  
Growing Degree Days ◽  
Sander Vitreus ◽  
Degree Days ◽  
Regional Management ◽  
Dependent Growth

Growing degree-days (GDD, °C·days) are an index of ambient thermal energy that relates directly to an ectotherm’s cumulative metabolism but is rarely used to describe growth and development in fish. We applied GDD to length and maturity data from 416 populations of walleye ( Sander vitreus ) from Ontario and Quebec, Canada (mean annual GDD = 1200 to 2300 °C·days). On average, males matured after they had experienced 6900 °C·days and reached 350 mm total length (L) (n = 77 populations), and females matured after 10 000 °C·days and at 450 mm L (n = 70). Across 143 populations, GDD accounted for up to 96% of the variation in the length of immature walleye but also revealed a twofold difference in growth rate that was indicative of variation in food availability. When applied to data from eight populations in which walleye abundances have changed dramatically over time, GDD revealed a 1.3-fold increase in immature growth rate when abundance was low compared with when it was high. Our results both demonstrate the explanatory power of GDD with respect to fish growth and maturity and inform the development of regional management strategies for walleye.

Individual Differences in the Enjoyment of Negative Emotion in Music: A Literature Review and Experiment

2011 ◽  
Vol 28 (3) ◽  
pp. 279-296 ◽  
Author(s):  
Sandra Garrido ◽  
Emery Schubert
Keyword(s):  
Factor Analysis ◽  
Individual Differences ◽  
Literature Review ◽  
Regression Model ◽  
Negative Emotion ◽  
Negative Emotions ◽  
Positive Relationships ◽  
Fantasy Proneness ◽  
Emotions In Music

Why do People Seek out Music that Makes Them cry? This paradox is a complex one that appears to have no single answer. Rather, numerous factors appear to be interacting in the diverse responses of individuals to music. The present study tested the hypothesis that individual differences in dissociation, absorption, fantasy proneness, empathy, and rumination would be related to the enjoyment of negative emotion in music. Fifty-nine participants completed a survey pertaining to this question. Results revealed statistically significant positive relationships between enjoyment of evoked negative emotion in response to music with both absorption and the recently reported construct of 'music empathy,' Factor analysis and a regression model confirmed these results, and the approach suggests that further study of individual differences will continue to provide new insights into some of the subtleties of the enjoyment of negative emotions in music.

Emotion and Behavior: A General Factor of Personality From the EAS Temperament Survey and the Strengths and Difficulties Questionnaire

2012 ◽  
Vol 15 (5) ◽  
pp. 668-671 ◽  
Author(s):  
Livia Veselka ◽  
Julie Aitken Schermer ◽  
Caroline Just ◽  
Yoon-Mi Hur ◽  
J. Philippe Rushton ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Individual Differences ◽  
Social Desirability ◽  
Principal Factor ◽  
Strengths And Difficulties Questionnaire ◽  
General Factor ◽  
Order Dimension ◽  
General Factor Of Personality ◽  
Strengths And Difficulties ◽  
And Behavior

The mothers of 603 pairs of 3- to 13-year-old twins in Korea completed the Emotionality, Activity, Sociability (EAS) Temperament Survey and the Strengths and Difficulties Questionnaire in reference to their twins. Principal factor analysis of the seven scales comprising these measures yielded a general factor on which all the scales had moderate to large loadings. Univariate behavioral genetic analyses showed that individual differences on this general factor could best be accounted for by additive genetic and non-shared environmental effects, with a heritability of 53%. The results strengthen the construct validity of the general factor of personality (GFP) by extracting this higher-order dimension from disparate measures, and have implications regarding social desirability criticisms applied to the GFP theory.

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