Influence of Types and Doses of Fertilizer on the Physicochemical Characteristics of Water, Composition and Structure of Zooplankton Populations in Ponds

Abstract

In order to improve fish productivity, an essay on the evaluation of the comparative effect of chicken and pig manure on the composition and structure of zooplankton was conducted at the Application and Research farm from the University of Dschang (LN: 5º44'-5 °36 and LE: 10º06'-9 ° 85'). For this purpose, 15 ponds (5.7 x 5.7 x 1m), three doses of 0 (control); 800 and 1000kg/ha of chicken manure as well as pig dung were used. At each of the randomly selected ponds was administered one of the fertilizer doses every 7 days. Each of the doses and type of fertilizer representing a treatment was repeated three times. The physicochemical characteristics of the water and the zooplankton population were measured every 14 days. With respect to the physicochemical characteristics of water, the values of nitrites (7.92 ± 0.05mg/l), nitrates (8.03 ± 0.24mg/l), phosphates (4.68 ± 0, 05mg/l) were significantly (p <0.05) higher in ponds fertilized at 1000kg/ha pig dung, the lowest being obtained in the control treatment. For zooplankton, the highest specific (64.51% of total species), generics (87.87% of total genera) and families (82.35% of total) zooplanktonic abundances were obtained in ponds fertilized at the rate of 1000kg/ha of chicken manure. The species of rotifers were the most diverse survived those of cladocerans whatever the type or the dose of fertilizer. The use of the 1000kg/ha dose of chicken droppings makes sense for a large production of zooplankton diversity.

Influence of Types and Doses of Fertilizer on the Physicochemical Characteristics of Water, Composition and Structure of Zooplankton Populations in Ponds

“…The same trend was obtained by Dakwen et al [7] in fish pond. Our results are dissimilar to those reported by Elegbe et al [28] who achieved the dominance of cladocerans. and mesotrophic media by Shiel [29,30].…”

“…The specific richness of zooplankton in fertilized ponds was significantly higher compared to that of the control ponds. This trend corroborates that reported by Adedeji et al [27,28]. This observation confirms the hypothesis that the contribution of biogenic elements in a body of water influences its planktonic richness, especially zooplankton.…”

“…Results on the effect of fertilizer types and doses on zooplankton biodiversity have shown that zooplankton species, species, and species richness increased significantly with fertilizer types and doses. The richness of the species identified independently of the treatments was greater than 70 and 69 species respectively obtained by Adedeji et al [27] Dakwen et al [7] in fish pond, as well as 30 species identified by Elegbe et al [28] in a traditional aquaculture system, "Whedos". The differences observed would be due either to the types and doses of fertilizers, the sampling effort (twice a month versus one), the size of the plankton net (40μm versus 64μm) and the predation of the fish.…”

Health Risks Related to the Water Quality in the Obili Fish Pond

“…D. latrum has the highest density of parasites found in the pond. This high density could be explained by the fact that this species has fish as an intermediate host and the piscicultural activity is generally more intense in the center of the pond (Dakwen et al, 2019(Dakwen et al, , 2015Towa et al, 2019). Pathogens that concentrate in the viscera of fish or infest their tissues can survive and in some cases reproduce until the fish are harvested and consumed (World Health Organization, 1994).…”