Length-Weight relationship and condition factor of tilapia species grown in marine and fresh water ponds

Nehemia, Alex; Maganira, Justine Daudi; Rumisha, Cyrus

doi:10.5251/abjna.2012.3.3.117.124

Cited by 109 publications

(97 citation statements)

References 12 publications

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“…In the other hand, for TM25 group the HSI fall in the physiological range even if higher than that of the TM0 group. However, both TM25 and TM50 groups had a higher CF than that TM0 group, indicating that fish of the 2 first groups attained a better general condition (Nehemia et al, 2012). Opposite results were obtained for HSI in rainbow trout with a decrease in this index value at the increase of TM levels in the diets .…”

Section: Discussionmentioning

confidence: 58%

Effect of Tenebrio molitor larvae meal on growth performance, in vivo nutrients digestibility, somatic and marketable indexes of gilthead sea bream (Sparus aurata)

Piccolo

Iaconisi

Marono

et al. 2017

Animal Feed Science and Technology

164

134

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The aim of this study was to evaluate the effects of the inclusion of Tenebrio molitor larvae meal in practical diets for gilthead sea bream on growth performance, nutrients digestibility, somatic and marketable indexes. Two separate trials were carried out: in the first a total of 153 gilthead sea bream (105.2 ± 0.17 g average initial body weight) were randomly allocated in 9 fiberglass 220 liter tanks (17 fish per tank) in an indoor water recirculating system. The fish were fed three isoenergetic and isoproteic diets formulated to contain increasing levels of TM meal inclusion and precisely: a control diet (TM0), in which fish meal was the main protein source; TM25 and TM50 diets, in which 25% and 50% of Tenebrio molitor larvae meal was added to the diet, respectively. These inclusion rates corresponded to 30% and 60% of inclusion on protein bases and 35% and 71% of fish meal substitution on protein bases for TM25 and TM50 diets, respectively. Each diet was randomly assigned to 3 tanks and the trial lasted 163 days. In the second trial the apparent digestibility coefficients of the 3 diets were measured on 72 fish randomly distributed to 3 digestibility tank-units (24 fish per unit, average body weight: 86.97±2.3 g) using an indirect method (acid insoluble ash).The group fed TM25 showed a higher (P < 0.05) final weight, specific growth rate, weight gain %, protein efficiency ratio, and a lower feed conversion ratio compared to the other 2 groups. The estimated apparent digestibility coefficients of crude protein and ether extract of the diets were lower (P < 0.01) in TM50 than in the other 2 groups. No significant differences have been found between TM0 and Tenebrio molitor larvae meal groups in morphometric and commodity-related characteristics, except for dressed yield and viscerosomatic index (VSI), that resulted the lowest and the highest, respectively, in TM50. The skin colour resulted to be affected by dietary inclusion of insect meal, especially at 50% of inclusion. The general evaluation of the results demonstrates that Tenebrio molitor larvae meal can replace fish meal up to 25% of inclusion in the diet for Sparus aurata without negative effects on weight gain, crude protein and ether extract digestibility, marketable indexes after 163 days feeding. On the contrary, when Tenebrio molitor larvae meal was included at 50%, nutrient digestibility, dressed yield, VSI and skin colour were penalized.

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Section: Discussionmentioning

confidence: 58%

Effect of Tenebrio molitor larvae meal on growth performance, in vivo nutrients digestibility, somatic and marketable indexes of gilthead sea bream (Sparus aurata)

Piccolo

Iaconisi

Marono

et al. 2017

Animal Feed Science and Technology

164

134

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“…When condition factor value is higher it means that the fish has attained a better condition. The condition factor of fish can be affected by a number of factors such as stress, season and availability of food (Nehemia, Maganira, & Rumisha, 2012). Condition factor is also a biomarker at the individual level (Le Cren, 1951) being frequently used to assess the physiological condition, based on the principle that individuals exhibit higher weight when they have better condition associated with food resources in a given area (De Silva, Gunasekera, Austin & Graeme, 1998;Vila-Gispert & Moreno-Amich, 2001;Chakrabarti & Kundu, 2015).…”

Section: Introductionmentioning

confidence: 99%

<b>The use of biomarkers for assessing effects of pollutant stress on fish species from a tropical river in Southeastern Brazil

Morado

Araújo

Gomes

2017

Acta Sci. Biol. Sci.

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ABSTRACT. Biomarkers are measurements within an organism that respond to environmental effects and are used as tools in bioassessment programs since they reflect physiological changes induced by exposure to pollutants. The hepatosomatic index (HSI) and the condition factor (CF) in three fish species Geophagus brasiliensis, Hypostomus affinis and Hypostomus auroguttatus were used to assess effects of pollutant stress in a tropical river during two seasons (dry and wet). Fish from the least disturbed sites had the lowest condition factor (CF) and the lowest HSI, whereas those from sites near pollutant discharges had the highest CF and HSI. Higher HSI and lower CF occurred during the dry season. It is suggested that species adapted to stressful conditions take advantage on food availability from organic loads or unoccupied niches by lesser tolerant species, increasing CF. We concluded that higher HSI values were directly associated with environmental stress whereas the higher CF values are related to availability of food resources derived from organic loads or other sources. CF and HSI are simple and cost-effective, thus suitable as routine screening tools in pollution monitoring, but caution should be taken in relating changes in physiological measurements and any specific pollutant to prevent misinterpretation.Keywords: condition factor, hepatosomatic index, fishes, monitoring, rivers.O uso de biomarcadores para avaliar efeitos de estresses de poluentes sobre espécies de peixes em um rio tropical no sudeste do Brasil RESUMO. Biomarcadores são medidas dentro de um organismo que respondem a efeitos ambientais e são utilizadas em programas de bioavaliação, já que refletem alterações fisiológicas induzidas pela exposição a poluentes. O índice hepatossomático (IHS) e o fator de condição (FC) das espécies Geophagus brasiliensis, Hypostomus affinis e Hypostomus auroguttatus foram calculados em um rio tropical durante duas estações (seca e cheia). Peixes de locais menos alterados apresentaram menores FC e IHS, enquanto os de locais próximos de descargas de poluentes apresentaram maiores FC e IHS. Maiores IHS e menores FC ocorreram durante a estação seca, comparados com a estação chuvosa. É sugerido que espécies adaptadas às condições estressantes levam vantagem da disponibilidade de alimentos próxima às descargas orgânicas ou nichos não ocupados por espécies menos tolerantes, aumentado o FC. Os valores mais elevados do IHS foram diretamente associados ao estresse ambiental, enquanto os valores mais elevados FC estão relacionados com a disponibilidade de recursos alimentares derivados de descargas orgânicas ou outras fontes. FC e IHS são simples e de baixo custo, portanto, adequados como ferramentas no controle da poluição, mas cuidados devem ser tomados ao relacionar suas mudanças às medições fisiológicas ou a qualquer poluente específico para evitar efeitos de interferência.Palavras-chave: fator de condição, índice hepatossomático, peixes, monitoramento, rios.

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“…Fish can attain either isometric, negative allometric or positive allometric growth in its life (Nehemia et al, 2012). Isometric growth (b=3) is the type of growth when all the body parts grow at an approximately the same rate as the fish grows.…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand it is a measure of various biological and ecological factors with regard to their feeding conditions (Nehemia et al, 2012). Food availability in the water bodies are influenced by the changes in the water chemistry due to variations in the atmosphere and the surrounding environments (Pothoven et al, 2001).…”

Section: Fulton Condition Factor (Fcf)mentioning

confidence: 99%

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Length-Weight Relationship and Condition Factor of African Big Barb <i>Labeobarbus intermedius</i> (Ruppell, 1836) in Ethiopian Freshwater Bodies: A Review

Tesfahun

Temesgen²,

Prabhadevi³

2018

ija

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The investigations on length-weight relationship and condition factor of the African big barb Labeobarbus intermedius (Rüppell, 1836) in Ethiopian water bodies have shown varied pattern including nearly isometric (b ≈ 3), negative (b < 3) and positive (b > 3) allometric. The Fulton condition factor (K) of L. intermedius is high (1.73) in Lake Ziway, however, declined in most rivers and lakes and also exhibits seasonal variation. Fish had a better body condition (2.73) during wet season in Angereb and Sanja Rivers. There is variation in condition factor with respect to sex in which females had better body condition (1.88) in Lake Ziway. The length-weight relationship and condition factor of L. intermedius is correlated with availability of food and water quality parameters justifying the need for effective management of this fish stock for conservation and continued fishing.Keywords Fulton Condition Factor; Length-weight; L. intermedius BackgroundThe African big barb Labeobarbus intermedius is a widely distributed fish species in Northern Kenya and in most parts of Ethiopian drainage basin (Dadebo et al., 2013). It is widely distributed in the rift valley basin, Abay basin and Baro-Akobo basin part of Ethiopia, of which Lake Tana harbors the largest number of big barb species (Vijverberg et al., 2012;Awoke, 2015). It is one of the most commercially important fish species in the country (LFDP4, 1997;Bjørklis, 2004;Desta et al., 2006). The total annual yield of L. intermedius from the total inland water bodies is estimated to be about 365 tons per year (LFDP, 1997). However, recently L. intermedius catch from rift valley lakes (Lake Hawassa and Lake Koka) declined and reported to be unsafe for human consumption due to high mercury concentration (Mengesha, 2009). The decline of the fish species due to overfishing and parasitic infection has result the less accessibility of the fish on the local markets (Desta et al., 2006;Mengesha, 2009;Dadebo et al., 2013). Length-weight relationship (LWR) is one of the most important biological tools in fishery management. It is used to estimate the average weight at which a fish can attain the given length (Lawson et al., 2013). Relationship between the two also indicates the wellbeing of fishes (Hamid et al., 2015). The difference in LWR is based on the inherited body shape and condition of individual fish. Condition factor shows the degree of wellbeing of fishes in their habitat, which is expressed by coefficient of body condition. It is a measure of various biological and ecological factors with regard to their feeding conditions (Nehemia et al., 2012). High values of condition factor indicate better body condition. However it is affected by stress, sex, season, availability of food and the quality of water where it grows (Ighwela et al., 2011).The study of length-weight relationship and condition factor of freshwater fish species is a subject of continuous research as it is a basis for the development of a successful management program on fish capture and culture (Sh...

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Length-Weight relationship and condition factor of tilapia species grown in marine and fresh water ponds

Cited by 109 publications

References 12 publications

Effect of Tenebrio molitor larvae meal on growth performance, in vivo nutrients digestibility, somatic and marketable indexes of gilthead sea bream (Sparus aurata)

Effect of Tenebrio molitor larvae meal on growth performance, in vivo nutrients digestibility, somatic and marketable indexes of gilthead sea bream (Sparus aurata)

<b>The use of biomarkers for assessing effects of pollutant stress on fish species from a tropical river in Southeastern Brazil

Length-Weight Relationship and Condition Factor of African Big Barb <i>Labeobarbus intermedius</i> (Ruppell, 1836) in Ethiopian Freshwater Bodies: A Review

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