Spatio-temporal changes in the abundance of the populations of the gastrotrich community in a shallow lake of tropical Africa

Togouet, Serge Hubert Zébazé; Njiné, Thomas; Kemka, Norbert; Nola, Moı̈se; Menbohan, Samuel Foto; Koste, Walter; Boutin, Claude; Hochberg, Rick

doi:10.1016/j.limno.2007.06.003

Cited by 7 publications

(1 citation statement)

References 20 publications

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“…The studied dietary treatments affected electrical conductivity (EC) values with values highest in "Le" treatment. The higher EC values observed in "Le" treatment could be because it produced more waste (due to the higher growth of its fish) which increased its content of ionizable salts and consequently its electrical conductivity [58]. The values observed were within the desirable range of 100-2000µm/cm and the acceptable range of 30-5 000 µm/cm as recommended by Boyd and Tucker [59] and Stone and Thomforde [60] for fish culture.…”

Section: Discussionmentioning

confidence: 71%

Water Quality Effects on Survival and Weight of Tank-Raised African Catfish (Clarias gariepinus, Burchell, 1822) Fed Commercial and Farm-made Feeds

Nindum,

Tchiedjo Marie Laure D.,

Boudem Tsane Cecile R.

et al. 2023

JEAI

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The present study was carried out to assess the effect of water quality on survival and weight of tank-raised Clarias gariepinus fed with commercial and farm-made feeds. Nine hundred juveniles (15.15± 3.48g; 128.366± 9.67mm) were stocked in 09 IBC (Intermediate Bulk Container) tanks (1m3 each) at a density of 100 fish/tank and fed with imported (Le), locally pelleted (Lpe) and locally extruded (Lex) feeds thrice a day for 16 weeks. Water quality parameters (water temperature, suspended particles, turbidity, colour, total dissolved solids, electrical conductivity, pH, dissolved oxygen, nitrates, nitrites, ammonia and phosphates) were measured every fortnightly using standard methods. Survivals were determined from the initial and final counts of studied fish and body weight was determined biweekly using a sensitive electronic balance. Regardless of dietary treatments and rearing period, studied water parameters did not differ significantly (p>0.05) except for Total Dissolved Solids (TDS), electrical conductivity (EC), pH and nitrites (p<0.05). The study also revealed that all the parameters were within acceptable or desirable ranges for fish farming except for dissolved oxygen and ammonia which were below (<3mg/l) and above (>0.05mg/l) optimal recommended ranges respectively. In addition, water temperature, turbidity, total dissolved solids, pH and ammonia had a significant effect (p<0.05) on the survival and weight of African catfish. The study concluded that dissolved oxygen and ammonia could have detrimental effects on studied fish growth. However, the fact that the studied fish were exposed short term in holding water as an exchange of water was carried out every day and a complete exchange every fortnightly with well oxygenated water, significantly contributed in reducing the abnormal contents of dissolved oxygen and ammonia. This implies that if best management practices are respected, the studied feeds will not deteriorate holding tank waters and thus not affect fish productivity.

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Section: Discussionmentioning

confidence: 71%

Water Quality Effects on Survival and Weight of Tank-Raised African Catfish (Clarias gariepinus, Burchell, 1822) Fed Commercial and Farm-made Feeds

Nindum,

Tchiedjo Marie Laure D.,

Boudem Tsane Cecile R.

et al. 2023

JEAI

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Dynamic of phytoplankton size-class and photosynthetic activity in a tropical hypereutrophic lake: the Yaounde municipal lake (Cameroon)

et al. 2009

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This study carried out within the framework of a multi-disciplinary project, aimed at highlighting the fundamental processes governing the functioning of the hypertrophic Yaoundé Municipal Lake. It was based on the hypothesis that, even within a small range of lake trophic status, important variations can occur in the species composition, biomass and photosynthetic activity of the phytoplankton size-fractions. For this purpose, samples were taken at weekly intervals from November 1996 to December 1997 at a fixed set of depths in the water column. Spatial-temporal fluctuations of some physical-chemical variables, associated with biological variables such as phytoplankton size-class species composition, phytoplankton size-class biomass, phytoplankton primary production and chlorophyll-a were analysed. The water transparency was low and rarely exceeded 100 cm. Conductivity values relatively higher increased generally from the top to the lake bottom. The oxygen deficiency, and sometimes anoxia, recorded from 2.5 m depth resulted in high quantities of ammonium nitrogen. Total phosphorus and total Kjeldahl nitrogen concentrations were characteristics of hypertrophic lakes. The fertility of this biotope favoured the development of a high phytoplanktonic community with remarkable physiological adaptations to the variations of the nutritive potentials of the lake, characterized by the sizestructure of these organisms. Cells of small size (\12 lm) contributed up to 11.42% of the total phytoplanktonic biomass. Species with average size (12-45 lm), dominated by Chlamydomonas spp., represented a more significant contribution reaching up to 69.85%, whereas the cells of big size ([45 lm), mainly Euglenophyta, maintained the relatively most important biomass, accounting for up to 89.85% of the total phytoplanktonic biomass. Chlorophyll-a concentrations are among the highest reported for both fresh water and sea water, being a consequence of high proportions of Chlorophyta and Euglenophyta. This led to intense phytoplanktonic photosynthetic activity which continued throughout the year, even though it was confined to the upmost first meter of the water column. Analyses pointed out the allogenic nature of the functioning of this urban lake ecosystem, due to a poor waste management on the surrounding landscape.

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The curious and neglected soft-bodied meiofauna: Rouphozoa (Gastrotricha and Platyhelminthes)

et al. 2020

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Spatio-temporal changes in the abundance of the populations of the gastrotrich community in a shallow lake of tropical Africa

Cited by 7 publications

References 20 publications

Water Quality Effects on Survival and Weight of Tank-Raised African Catfish (Clarias gariepinus, Burchell, 1822) Fed Commercial and Farm-made Feeds

Water Quality Effects on Survival and Weight of Tank-Raised African Catfish (Clarias gariepinus, Burchell, 1822) Fed Commercial and Farm-made Feeds

Dynamic of phytoplankton size-class and photosynthetic activity in a tropical hypereutrophic lake: the Yaounde municipal lake (Cameroon)

The curious and neglected soft-bodied meiofauna: Rouphozoa (Gastrotricha and Platyhelminthes)

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