The effect of periphyton substrate density on production in freshwater polyculture ponds
The effect of periphyton substrate density on production in freshwater polyculture ponds
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DOI：
10.1016/j.aquaculture.2003.08.010
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发表时间：
2004-04-05
期刊：
影响因子：
4.5
通讯作者：
Verdegem, MCJ
中科院分区：
文献类型：
--
作者：
Azim, ME;Wahab, MA;Verdegem, MCJ
本研究调查了土池中的附着生物基质的最佳表面积放养与预优化的密度和比例的印度主要鲤鱼，猫（猫猫），罗胡（野Labeo rohita）和kalbaush（野Labeo calbasu），以支持提高鱼类产量。试验设4个处理，一式3份：无基质（对照）、50%（处理S-50）、75%（处理S-75）和100%（处理S-100）。对照处理的Secchi圆盘深度和总氨浓度高于基质处理。所有处理池的平均溶解氧浓度均高于5 mgl（-1），从未低于临界水平。无底质的池塘浮游植物细胞较多。在处理S-50中，每表面积的周生植物干物质较低。从周丛垫中鉴定出约32个属的藻类和10个属的浮游动物。所有基质处理的catla净产量均高于对照处理，但3种基质密度之间的产量差异不显著。处理S-100的净产量高于处理S-50和对照，但与处理S-75差异不显著。处理S-100的产草量高于其他处理。处理S-100的3种牧草的综合净产量高于对照和处理S-50，但与处理S-75差异不大。结果发现，组合网鱼产量与基质密度呈线性相关（R-2 = 0.93）。投加50%、75%和100%的基质比对照分别增产114%、168%和209%。得出的结论是，任何数量的基板面积安装在池塘高达100%的池塘表面积将增加生产。(C)2004 Elsevier B. V.保留所有权利。
The present research investigated the optimum surface area of periphyton substrate in earthen ponds stocked with a pre-optimized density and ratio of the Indian major carps, catla (Catla catla), rohu (Labeo rohita) and kalbaush (Labeo calbasu) to support enhanced fish production. Four treatments in triplicate were tried: no substrate (control), bamboo submerged substrate equal to 50% (treatment S-50), 75% (S-75) and 100% of the pond surface area (S-100).Water temperature ranged between 17 and 28 degreesC, which is relatively low for tropical fish culture. Secchi disc depth and total ammonia concentrations were higher in control treatment than in substrate treatments. The average dissolved oxygen concentrations were higher than 5 mgl(-1) in all treatment ponds and never fell below critical levels. More phytoplankton cells were found in ponds without substrates. Periphyton dry matter per surface area was lower in treatment S-50. About 32 genera of algae and 10 genera of zooplankton were identified from periphytic mats.Net yields of catla in all substrate treatments were higher than in control treatment, but the yields did not vary significantly among three substrate densities. Net yield of rohu in treatment S-100 was higher than in treatment S-50 and control, but not different from treatment S-75. Kalbaush yield in treatment S-100 was higher than in the other treatments. The combined net yield of the three species was higher in treatment S-100 than in the control and treatment S-50, but was not different from treatment S-75. It was found that combined net fish yields were linearly correlated (R-2 = 0.93) with substrate density. The added substrate density equal to 50%, 75% and 100% of the pond surface areaincreased production by 114%, 168% and 209%, respectively, compared to the control. It was concluded that any amount of substrate area installed in the ponds up to 100% of the pond surface area will increase production. (C) 2004 Elsevier B.V. All rights reserved.