The impact of varying nutrient regimes in earthen freshwater ponds on the comparative ecology of diurnally occurring candidate live feeds

Adewale, A.M. and Ebinimi, A. (2005) The impact of varying nutrient regimes in earthen freshwater ponds on the comparative ecology of diurnally occurring candidate live feeds. In: 19th Annual Conference of the Fisheries Society of Nigeria (FISON) , 29 Nov - 03 Dec 2004 ,Ilorin, Nigeria, pp. 787-795.

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Abstract

The daytime composition and relative abundance of zooplankton species were studied in three treatments of two replicate earthen ponds each with nutrient sources and water replenishment regimes. Treatment -A (200m super(2) surface area supplied 900kgha super(-1) pig manure only). Treatment -B (200m super(2) surface area supplied 70kgha super(-1) month super(-1) pig manure, 50kgha super(-1) month super(-1) N.P.K. [15:15:15] and 30kgha super(-1) month super(-1) Urea) and Treatment-C (1500m2 surface area supplied 1150kgha super(-1) month super(-1) commercial grade 40% crude protein compounded feed). Water replenishment for Treatment A was daily tidal deluge from the New Calabar River while that for treatment B and C was from column-well and occasional rains. No zooplankton species were recovered from the pig-manure only treatment (A) while only Diffugia constricta and Difflugia urceolata were the two protozoans that occurred together in treatments B (combined fertilization) and C (compounded feed only) in contrast, Difflugia acuminate and three rotifers, Collurella uncinata, Diurella stylata and Keratella quadrata occurred only treatment B. similarly, Arcella arenaria, Arcella costata, Centropyxis aculeate, Difflugia pyriformis, Branchionus calyciflorus, Lepadella patella, Polyarthra trigla and Onchocanmptus mohammedi were recovered from treatment C. Arcella costata was the most abundant zooplankton in the entire experiment, while Arcella arenaria was very abundant in treatment C, Collurella uncinata was very abundant in treatment B. The inference is that combined fertilization of earthen freshwater ponds tend to be more suitable for the culture of rotifers such as Brachionus calyciflorus, popular in fish larva nursery, while those supplied compounded feed could be used to produce protozoans where desirable

Item Type: Conference or Workshop Item
Title: The impact of varying nutrient regimes in earthen freshwater ponds on the comparative ecology of diurnally occurring candidate live feeds
Personal Creator/Author:
CreatorsEmail
Adewale, A.M.
Ebinimi, A.
Page Range: pp. 787-795
Date: 2005
Event Title: 19th Annual Conference of the Fisheries Society of Nigeria (FISON)
Event Type: Conference
Event Location: Ilorin, Nigeria
Event Dates: 29 Nov - 03 Dec 2004
Issuing Agency: Fisheries Society of Nigeria
Uncontrolled Keywords: Nigeria; fertilizers; fish larvae; fish ponds; food organisms; nutrition; organic wastes; zooplankton; Arcella; Brachionus calyciflorus; Centropyxis; Colurella uncinata; Difflugia; Keratella; Lepadella patella; Polyarthra trigla; Protozoa; Rotifera
Subjects: Biology
Aquaculture
Item ID: 4115
Depositing User: Ms Maria Kalentsits
Date Deposited: 31 Aug 2010 13:11
Last Modified: 29 Sep 2011 16:32
URI: http://aquaticcommons.org/id/eprint/4115

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