Heterogeneous growth fingerlings of the Nile tilapia Oreochromis niloticus: effects of density and initial size variability

Barbosa, José Milton; Brugiolo, Sônia Sin Singer; Carolsfeld, Joachim; Leitão, S. S.

doi:10.1590/s1519-69842006000300020

Cited by 20 publications

(15 citation statements)

References 13 publications

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“…Several authors have reported that crowding intensifies the heterogeneous fish growth, due to the competition for a sparse supply of adequate food or social dominance, which often coincides with increasing fish densities (Sahoo et al, 2004;Jha & Barat, 2005;Barbosa et al, 2006). When growth is density dependent, partial harvest of the standing fish have been use to decrease competition, and thereby increasing individual growth rate.…”

Section: Effect Of Density On Fish Growth and Survivalmentioning

confidence: 99%

Performance of Nile tilapia Oreochromis niloticus fingerlings in a hyper intensive recirculating aquaculture system with low water exchange

Klanian¹,

Arámburu-Adame²

2013

lajar

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ABSTRACT. The aim of this paper was evaluate the performance of Nile tilapia fingerlings (Oreochromis niloticus) raised at hyper intensive stocking density in a recirculating aquaculture system (RAS) with minimum water replacing. The experimental system was performed in a single-batch nursery system to obtain 50 g fish size in 60 days. Fish (2.07 ± 0.04 g) were stocked in triplicate at 400 (T1), 500 (T2) and 600 (T3) ) was significantly higher than T3 (0.83 g day -1 ; 4.80% day -1 ). The specific growth rate (SGR) of T1 was 41% influenced by temperature. For T2 and T3 the SGR were influenced by the variation of dissolved oxygen (DO) that explained 47 and 44% of the fish weight variation, respectively. The SGR from T3 was also affected by the concentration of ammonia nitrogen (31%). The high stocking density affected the overall size of fish and the size homogeneity, but had no negative effect on the length-weight relationship (L-W). Data support the conclusion that fingerling stocked at 400 and 500 fish m -3 shows high performance during 9-weeks when the biomass not exceed 37 kg m -3 . At this time fish have reached the desired final nursery weight (50 g) for transfer to grow-out facilities. Keywords: Nile tilapia, recirculating aquaculture system, low water exchange, intensification. Rendimiento de juveniles de tilapia del NiloOreochromis niloticus en un sistema híperintensivo de recirculación acuícola con mínimo recambio de agua RESUMEN. El objetivo de este trabajo fue evaluar el rendimiento de juveniles de tilapia del Nilo Oreochromis niloticus sembrados en densidades hiperintensivas en un sistema de recirculación acuícola (SRA) con mínimo remplazo de agua. El sistema experimental consistió en un sistema de precría de cosecha única para obtener peces de 50 g en 60 días. Los peces (2,07 ± 0,14 g) se sembraron por triplicado a densidades de 400 (T1), 500 (T2) y 600 (T3) peces m -3 (0,84; 1,05; 1,22 kg m -3 ). El SRA funcionó con 12.000 L de agua recirculante y un remplazo diario de 252 L (2,1% por día). La densidad de siembra no afectó significativamente la supervivencia (89,5-93,6%). El biofiltro removió el amonio nitrogenado total con una eficiencia del 46,9 ± 7,0%. La tasa de crecimiento de T1 (0,96 g día -1 ; 5,01% día ; 4,80% día -1 ). La temperatura influyó 41% en la tasa de crecimiento específico (TCE) de T1. La concentración de oxígeno disuelto (DO) influyó en la variación de peso en T2 (47%) y T3 (44%). La TCE de T3 también se vio afectada por la concentración de nitrógeno amoniacal (31%). El aumento de la densidad de siembra afectó el tamaño y la homogeneidad de tallas de los peces, pero no afectó la relación longitud-peso (L-P). Los datos respaldan la conclusión que los juveniles sembrados a densidades de 400 y 500 peces m -3 tienen alto rendimiento durante nueve semanas consecutivas, siempre y cuando la biomasa no se exceda de 37 kg m -3 . En este tiempo los peces alcanzan el peso final esperado de precría (50 g) y pueden ser transferidos hacia las instalaciones de engorde. Palabras clave: tilapia ...

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Section: Effect Of Density On Fish Growth and Survivalmentioning

confidence: 99%

Performance of Nile tilapia Oreochromis niloticus fingerlings in a hyper intensive recirculating aquaculture system with low water exchange

Klanian¹,

Arámburu-Adame²

2013

lajar

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“…However, competition and negative social interaction can decrease after some time and a stage of growth stabilization can then follow. This is due to the appearance of new dominant organisms and the stabilization of social hierarchies, which leads to individuals’ growth showing similar patterns, independent of their size (Barbosa et al [2006], Peacor et al [2007b]). Figure 1 illustrates the two stages of fish growth in accordance with these empirical findings.…”

Section: The Biological Modelsmentioning

confidence: 99%

Optimal Harvesting Time of Farmed Aquatic Populations With Nonlinear Size‐heterogeneous Growth

Araneda¹,

Hernández²,

Gasca‐Leyva³

2011

Natural Resource Modeling

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Abstract. This paper examines the question of optimal harvesting time in a size-heterogeneous farmed aquatic population, using a model reflecting the effect of population density on both overall mortality rate and individual growth. This analysis enables an optimal harvesting rule to be deduced. The results obtained are applied to shrimp culture in recirculation systems in Mexico. Numerical solutions are derived for different production scenarios. Assuming identical culture conditions, results are also obtained under the hypothesis of homogeneous population growth, the view traditionally taken in the relevant economic literature. The optimal harvesting times calculated tend to decrease with higher densities, although this rule fails under the size-heterogeneous population model. In general, optimal harvesting times are overestimated when size-homogeneity in the culture is assumed. Our analysis reveals that management predictions are significantly mistaken if the size-heterogeneity phenomenon is not taken into account.

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“…A critical problem in the production of Nile tilapia Oreochromis niloticus in intensive and hyper-intensive systems (30-400 fish m -3 ) is the heterogeneity of body size. The organisms in the same cohort show different growth rates in response to biotic and abiotic factors (Barbosa et al, 2006;Azaza et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of size heterogeneity of Nile tilapia (Oreochromis niloticus) on the optimal harvest time: a bioeconomics approach

Kim

Klanian

Seijo

2020

Lat. Am. J. Aquat. Res.

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A critical problem in the production of Nile tilapia Oreochromis niloticus in intensive and hyper-intensive systems is the heterogeneity of body sizes as it influences the final production and economic yield. The objective of this study was to calculate the bioeconomic effect of size heterogeneity on the production of Nile tilapia at a commercial level and to determine the optimum harvest time (OHT) considering four minimum marketable sizes target (Mms = 350, 400, 450, 500 g). Two seeding strategies were evaluated: homogeneous seeding (HM) with a 96.55 ± 24.51 g initial body weight and heterogeneous seeding (HT) with a 100.17 ± 5.91 g initial weight. Fish from both treatments were stocked at 40 fish m-3 in triplicate using a randomized design. The calculated quasi-profits of variable costs showed an inversely proportional relationship with the minimum market size in both groups. The smaller size dispersion in HM generated higher profits than HT. The OHT for Mms [350, 500 g] of HM population was 180 days, with a mode of 641 g. The OHT was also 180 days for the HT population but only for the Mms [350, 400 g] and a mode of 578 g. In terms of quasi-profits, the HM produced 19.93% more quasi-profit than the HT in the market size of 350 g at 180 days (HM = 0.50 US$ kg-1; HT = 0.44 US$ kg-1). The simple bioeconomic model presented here can help producers manage a series of economic decisions associated with OHT, when targeting different market segments requiring different Mms.

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Heterogeneous growth fingerlings of the Nile tilapia Oreochromis niloticus: effects of density and initial size variability

Cited by 20 publications

References 13 publications

Performance of Nile tilapia Oreochromis niloticus fingerlings in a hyper intensive recirculating aquaculture system with low water exchange

Performance of Nile tilapia Oreochromis niloticus fingerlings in a hyper intensive recirculating aquaculture system with low water exchange

Optimal Harvesting Time of Farmed Aquatic Populations With Nonlinear Size‐heterogeneous Growth

Effect of size heterogeneity of Nile tilapia (Oreochromis niloticus) on the optimal harvest time: a bioeconomics approach

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