Effects of Waterweed Density on Water Quality and Growth of Palaemonetes Sinensis in Ponds

doi:10.11924/j.issn.1000-6850.casb2021-0075

Abstract

Abstract:

In order to explore the influence of waterweed coverage area on aquaculture water quality and growth performance of Palaemonetes sinensis in ponds, in the experiment, three groups of 10%, 30% and 50% (A, B and C) waterweed densities were set up, and 500 thousand shrimp larvae with average weight of 0.01 g were cultured per 666.7 m ² in pond. The hydration index was measured once every 5 days, and the growth index and feed coefficient of shrimp were measured after the experiment. The results showed that: the water temperature was A>B>C after 20 days. The dissolved oxygen of B was higher than that of A after 15 days. The dissolved oxygen of C was higher than that of A and B in 25-45 days, and lower than A and B in 50-85 days, in the two periods, the dissolved oxygen of C was significantly different from A and B (P<0.01). From 35 to 85 days, the pH was C>B>A, and the difference was extremely significant among the three groups (P<0.01). In 15~25 days, ammonia nitrogen was A>B>C, while C>A>B was found in 40~85 days, and the difference was extremely significant (P<0.01) among the three groups. The nitrate nitrogen was A>B>C in 25~45 days, and C>A>B in 50~85 days, and the difference among the three groups was extremely significant (P<0.01). The growth index and unit yield were B>A>C. The feed coefficient was C>A>B, and there was a significant difference (P<0.05) between B and C. Based on the water quality indexes, the growth performance and the feed utilization, waterweed density of 30% area (B) is better than the other two groups under the experimental conditions.

Key words: waterweed, Palaemonetes sinensis, pond, water quality, growth performance

CLC Number:

S931.1

LIU Yanhui, YANG Bingkun, GAO Chunshan, LIU Tiegang, LI Xiuying, ZU Xiujie. Effects of Waterweed Density on Water Quality and Growth of Palaemonetes Sinensis in Ponds[J]. Chinese Agricultural Science Bulletin, 2022, 38(2): 100-105.

Figures/Tables 7

References 35

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项目	Wt/g	W/g	S/%	DW/(mg/d)	NW/g	IWR/%	SGR/(%/d)	K_FGR
A组	0.42±0.035^a	140.3±25.62^ac	65.93±6.60^a	4.86±0.41^a	0.41±0.035^a	4133.33±351.19^a	1.91±0.42^a	1.31±0.24^ab
B组	0.50±0.031^b	152.5±17.83^a	62.03±9.31^a	5.80±0.36^b	0.49±0.031^b	4933.33±305.51^b	1.99±0.27^b	1.16±0.14^a
C组	0.39±0.036^ca	119.7±13.91^bc	62.63±8.22^a	4.47±0.42^ca	0.38±0.036^ca	3800.00±360.56^ca	1.85±0.47^ca	1.43±0.16^b

项目	Wt/g	W/g	S/%	DW/(mg/d)	NW/g	IWR/%	SGR/(%/d)	K_FGR
A组	0.42±0.035^a	140.3±25.62^ac	65.93±6.60^a	4.86±0.41^a	0.41±0.035^a	4133.33±351.19^a	1.91±0.42^a	1.31±0.24^ab
B组	0.50±0.031^b	152.5±17.83^a	62.03±9.31^a	5.80±0.36^b	0.49±0.031^b	4933.33±305.51^b	1.99±0.27^b	1.16±0.14^a
C组	0.39±0.036^ca	119.7±13.91^bc	62.63±8.22^a	4.47±0.42^ca	0.38±0.036^ca	3800.00±360.56^ca	1.85±0.47^ca	1.43±0.16^b