scholarly journals Morphometric characteristics of four important fish species from the Rwandan side of Lake Kivu

2021 ◽  
Vol 14 (3) ◽  
pp. 219-228
Author(s):  
Antoine Nsabimana ◽  
Wellars Banzi ◽  
Valens Habimana ◽  
Colores Uwamariya ◽  
Dieudonne Mutangana
Keyword(s):  
Rural Communities ◽  
Fork Length ◽  
Economic Resources ◽  
Body Weight Data ◽  
Lake Kivu ◽  
Key Species ◽  
Peduncle Length ◽  
The Relationship ◽  
Weight Data ◽  
Limnothrissa Miodon

Inland fisheries are important socio-economic resources for rural communities in Africa. In Rwanda, about two million people directly depend on capture fisheries from Lake Kivu. Sustainable fisheries management requires monitoring of population dynamics that help devise effective intervention strategies. However, the relevant data such as length-length and length-weight relationships do not exist for most of the key species in Lake Kivu. The present study generated morphometric and body weight data for Limnothrissa miodon (n=82), Lamprichthys tanganicanus (n=55), Haplochromis vittatus (n=51) and Haplochromis graueri (n=34) from Lake Kivu. Length-weight relationships (W=aLb) were highly significant for all species (p < 0.0001), high adjusted R2 = 78 to 98% of the variance in weight explained by total length. Negative allometric length-weight relationships were found with regression slope (b) values of 2.7 for Limnothrissa miodon, 2.8 for H. graueri, and 2.8 for L. tanganicanus, and positive (b=3.4) for Haplochromis vittatus. Length-length relationships were highly significant for all species (p ≤ 0.0001), except for the relationship between total and caudal length for L. miodon, and total and caudal peduncle length for L. tanganicanus, both not significant at p > 0.05. The highest R2 was for the relationships between total and standard length for H. vittatus, and total and fork length for L. tanganicanus. No description of length-length relationships exists for these species in literature or in FishBase database. The data generated in the current study will be used to assess changes in fish populations over time.

QUANTIFICATION OF TUNA FISH TARGET STRENGTH USING QUANTITATIVE ECHO SOUNDER

2009 ◽  
Vol 1 (1) ◽  
Author(s):  
Henry M. Manik
Keyword(s):  
Wave Reflection ◽  
Fork Length ◽  
Research Programme ◽  
Yellowfin Tuna ◽  
Target Strength ◽  
Bigeye Tuna ◽  
Tuna Fish ◽  
Thunnus Obesus ◽  
The Relationship ◽  
Echo Sounder

A preliminary research programme was carried out in order to study the acoustic wave reflection or target strength (TS) of tuna fish using a quantitative echo sounder (QES). The relationships between TS to fork length (FL) and swimbladder volume, for bigeye tuna (Thunnus obesus) and yellowfin tuna (T. albacares) are investigated. The TS of bigeye tuna was about 3 dB higher than yellowfin tuna when comparing species at the same size. The result can be correlated to the swimbladder volume differencebetween species. The relationship between TS and swimbladder volume was quantified for both species.Keywords: tuna fish, target strength, quantitative echo sounder

Questioning territories and identities in the precolonial (nineteenth-century) Lake Kivu region

Africa ◽  
2021 ◽  
Vol 91 (3) ◽  
pp. 493-515
Author(s):  
Gillian Mathys
Keyword(s):  
Nineteenth Century ◽  
Political Power ◽  
Lake Kivu ◽  
Territorial Claims ◽  
The Relationship ◽  
The Way

AbstractThroughout Africa, contemporary boundaries are deemed ‘artificial’ because they were external impositions breaking apart supposedly homogeneous ethnic units. This article argues that the problem with the colonial borders was not only that they arbitrarily dissected African societies with European interests in mind, but also that they profoundly changed the way in which territoriality and authority functioned in this region, and therefore they affected identity. The presumption that territories could be constructed in which ‘culture’ and ‘political power’ neatly coincided was influenced by European ideas about space and identity, and privileged the perceptions and territorial claims of those ruling the most powerful centres in the nineteenth century. Thus, this article questions assumptions that continue to influence contemporary views of the Lake Kivu region. It shows that local understandings of the relationship between space and identity differed fundamentally from state-centred perspectives, whether in precolonial centralized states or colonial states.

scholarly journals Estimating my equilibrium energy intake during lockdown: very introspective study

BMJ ◽  
2020 ◽  
pp. m4561
Author(s):  
R A Lewis
Keyword(s):  
Body Weight ◽  
Energy Intake ◽  
Outcome Measures ◽  
Dietary Energy ◽  
Saturday Morning ◽  
Dietary Energy Intake ◽  
Body Weight Data ◽  
Tuesday Afternoon ◽  
Weight Data ◽  
At Home

AbstractObjectiveTo estimate the daily dietary energy intake for me to maintain a constant body weight. How hard can it be?DesignVery introspective study.SettingAt home. In lockdown. (Except every Tuesday afternoon and Saturday morning, when I went for a run.)ParticipantsMe. n=1.Main outcome measuresMy weight, measured each day.ResultsSleeping, I shed about a kilogram each night (1.07 (SD 0.25) kg). Running 5 km, I shed about half a kilogram (0.57 (SD 0.15) kg). My daily equilibrium energy intake is about 10 000 kJ (10 286 (SD 201) kJ). Every kJ above (or below) 10 000 kJ adds (or subtracts) about 40 mg (35.4 (SD 3.2) mg).ConclusionsBody weight data show persistent variability, even when the screws of control are tightened and tightened.

Fecundity Comparisons for Various Stocks of Lake Whitefish, Coregonus clupeaformis

1975 ◽  
Vol 32 (3) ◽  
pp. 404-407 ◽  
Author(s):  
M. C. Healey ◽  
C. W. Nicol
Keyword(s):  
Northwest Territories ◽  
Lake Erie ◽  
Fork Length ◽  
Nonlinear Relationship ◽  
Coregonus Clupeaformis ◽  
Lake Whitefish ◽  
Limited Data ◽  
Relative Fecundity ◽  
Great Slave Lake ◽  
The Relationship

We found no significant differences in slope or intercept for the regression of loge fecundity on loge fork length among samples of whitefish from four lakes near Yellowknife in the Northwest Territories. The equation describing the relationship between fecundity and fork length for these populations was:[Formula: see text]Five other populations for which length–fecundity relationships could be calculated had length exponents ranging from 3.20 to 4.38, suggesting a nonlinear relationship between weight and fecundity. Six of the nine populations as well as four others for which limited data were available all had similar relative fecundities. Fish from Buck Lake in Alberta and from Lake Erie had high relative fecundities while fish from Great Slave Lake had low relative fecundity.

scholarly journals Embryonic Toxicity of Insecticide Sumithion 50 Ec and Herbicide Fusilade S in Pheasants After Individual or Combined Administration

1999 ◽  
Vol 47 (1) ◽  
pp. 123-128 ◽  
Author(s):  
T. Varga ◽  
I. Hlubik ◽  
L. Várnagy ◽  
P. Budai ◽  
E. Molnár
Keyword(s):  
Staining Method ◽  
Pathological Examination ◽  
Individual Treatment ◽  
Morphological Alterations ◽  
Body Weight Data ◽  
Combined Administration ◽  
The Individual ◽  
Embryonic Toxicity ◽  
Weight Data ◽  
Macroscopic Examination

The purpose of this work was to determine the individual and combined effects of insecticide Sumithion 50 EC (50% fenitrothion) and herbicide Fusilade S (12.5% fluazifop-P-butyl) on the development of pheasant embryos. Eggs were treated by injection of various concentrations of pesticides into the air space on day 12 of incubation. Pathological examination of embryos was carried out on day 23 of the hatching period. Mortality rate, body weight data and morphological alterations were evaluated after the macroscopic examination. The skeletal staining method was used to detect deformities. The two pesticides used in combination moderated the toxic/teratogenic effects of individual treatment.

scholarly journals KONVERSI KEAGAMAAN PASCA 1965, MENGURAI DAMPAK SOSIAL BUDAYA DAN HUBUNGAN ISLAM KRISTEN DI PEDESAAN JAWA

Harmoni ◽  
2018 ◽  
Vol 16 (2) ◽  
pp. 218-240
Author(s):  
M. Alie Humaedi
Keyword(s):  
Social Relations ◽  
Social Life ◽  
Economic Resources ◽  
The Political ◽  
The Social ◽  
National Archives ◽  
Islam And Christianity ◽  
Political Economic ◽  
Heating Up ◽  
The Relationship

The relationship between Islam and Christianity in various regions is often confronted with situations caused by external factors. They no longer debate the theological aspect, but are based on the political economy and social culture aspects. In the Dieng village, the economic resources are mostly dominated by Christians as early Christianized product as the process of Kiai Sadrach's chronicle. Economic mastery was not originally as the main trigger of the conflict. However, as the political map post 1965, in which many Muslims affiliated to the Indonesian Communist Party convert to Christianity, the relationship between Islam and Christianity is heating up. The question of the dominance of political economic resources of Christians is questionable. This research to explore the socio cultural and religious impact of the conversion of PKI to Christian in rural Dieng and Slamet Pekalongan and Banjarnegara. This qualitative research data was extracted by in-depth interviews, observations and supported by data from Dutch archives, National Archives and Christian Synod of Salatiga. Research has found the conversion of the PKI to Christianity has sparked hostility and deepened the social relations of Muslims and Christians in Kasimpar, Petungkriono and Karangkobar. The culprit widened by involving the network of Wonopringgo Islamic Boarding. It is often seen that existing conflicts are no longer latent, but lead to a form of manifest conflict that decomposes in the practice of social life.

scholarly journals Citizenship and Educational Attainment amongst the Second Generation: An Analysis of Children of Immigrants in Finland

2017 ◽  
Author(s):  
Elina Kilpi-Jakonen
Keyword(s):  
Educational Attainment ◽  
Educational Outcomes ◽  
Second Generation ◽  
Children Of Immigrants ◽  
Immigrant Integration ◽  
Economic Resources ◽  
Upper Secondary Education ◽  
Upper Secondary ◽  
The Relationship ◽  
Intervening Variables

Citizenship acquisition is often viewed as an indicator of immigrant integration as well as an event that spurs integration further. Relatively little is know about the relationship between citizenship and integration for children of immigrants. This article examines the relationship between citizenship and educational attainment at approximately age 16 in Finland using register data. Results suggest that children of immigrants who are Finnish citizens have better educational outcomes than non-citizens, measured with three indicators of educational attainment. However, the Finnish citizens come from families with higher levels of educational and economic resources than non-citizens and this explains much of the relationship between citizenship and education. After controlling for intervening variables, second generation students with Finnish citizenship are found to be more likely to choose general rather than vocational upper secondary education compared to their peers who have another citizenship. It is argued that this reflects a difference in educational attitudes between the two groups.

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