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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2009, Vol. 3 Issue (2) : 216-220     DOI: 10.1007/s11703-009-0044-8
RESEARCH ARTICLE |
Ecological studies on medaka in a remained habitat in Qinhuangdao, Hebei, China
Zhiguo LI, Huiguang FU()
Ocean College of Agricultural University of Hebei, Qinhuangdao 066003, China
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Abstract  

Ecological studies were carried out in the remaining habitat for medaka (Oryzias latipes), a marsh in the suburbs of Qinhuangdao City, Hebei Province, China. Sewage released from villages increases the nutrient levels in open water areas of the marsh, while in cattail (Typha angustifolia) and reed (Phragmites communis) beds the nutrient levels are decreased. There are fewer zooplanktons in the cattail and reed beds than in the open water areas. Sampling fishes with trap nets showed that medaka lived in dense populations in the cattail and reed beds, while the other three fish species, wild goldfish (Carassius auratus), topmouth gudgeon (Pseudorasbora parva), and mud loach (Misgurnus bipartitus), occupied the open water areas in the marsh. A little amount of paradise fish (Macropodus chinensis) was also found in the marsh. Japanese freshwater shrimps (Macrobrachium nipponense) were found only in the influx canal from waterworks. Indoor aquarium experiments showed that the wild medaka in this marsh was easily cultured with commercial feed similar to domesticated strains. Some ecological aspects of the medaka were discussed based on the observations of the fish in the marsh.

Keywords medaka      Oryzias latipes      endangered fish      habitat      ecology     
Corresponding Authors: FU Huiguang,Email:huiguangfu@tom.com   
Issue Date: 05 June 2009
URL:  
http://academic.hep.com.cn/fag/EN/10.1007/s11703-009-0044-8     OR     http://academic.hep.com.cn/fag/EN/Y2009/V3/I2/216
parameterwastewater from waterworkswastewater from the villagewest banks of the marsheast banks of the marshcanal leading to the sea
DO8-12, Apr. -May (a)0-3, Apr. -May (b)3-7, Apr. -May (b)5-12, Apr. -May (a)2-5, Apr. -May (b)
/(mg?L-1)5-10, Jun. -Aug. (a)0-2, Jun. -Aug. (b)3-5, Jun. -Aug. (b)3-14, Jun. -Aug. (a)1-4, Jun. -Aug. (b)
7-11, Sept. -Nov. (a)0-3, Sept. -Nov. (b)4-8, Sept. -Nov. (a)7-11, Sept. -Nov. (a)2-6, Sept. -Nov. (b)
COD10-29, Apr. -May (a)146-266, Apr. -May (b)32-75, Apr. -May (b)14-30, Apr. -May (a)80-125, Apr. -May (b)
5-22, Jun. -Aug. (a)154-320, Jun. -Aug. (b)49-113, Jun. -Aug. (b)25-50, Jun. -Aug. (a)130-214, Jun. -Aug. (b)
12-24, Sept. -Nov. (a)100-278, Sept. -Nov. (b)40-94, Sept. -Nov. (b)23-40, Sept. -Nov. (a)80-137, Sept. -Nov. (b)
pH7.6-8.16.7-7.47.0-7.67.5-8.27.0-7.8
NH4++NH30-0.4, Apr. -May (a)0.8-1.8, Apr. -May (b)0.3-1.2, Apr. -May(b)0.1-0.5, Apr. -May(a)0.3-0.9, Apr. -May(a)
/(mg?L-1)0.2-0.6, Jun. -Aug. (a)1.9-4.6, Jun. -Aug. (b)1.0-2.9, Jun. -Aug. (b)0.3-0.8, Jun. -Aug. (a)1.0-2.9, Jun. -Aug. (b)
0.2-0.6, Sept. -Nov. (a)0.8-2.8, Sept. -Nov. (b)0.7-1.9, Sept. -Nov. (b)0--0.6, Sept. -Nov. (a)0.6-1.1, Sept. -Nov. (b)
NO3-0.2-0.4, Apr. -May0.5-0.9, Apr. -May0-0.7, Apr. -May0.4-0.9, Apr. -May0-0.6, Apr. -May
/(mg?L-1)0.1-0.5, Jun. -Aug.0-0.4, Jun. -Aug.0-0.3, Jun. -Aug.0-0.6, Jun. -Aug.0-0.9, Jun. -Aug.
0.2-0.5, Sept. -Nov.0.5-1.0, Sept. -Nov.0-0.8, Sept. -Nov.0-1.0, Sept. -Nov.0-0.9, Sept. -Nov.
NO2-0, Apr. -May (a)0.0-0.03, Apr. -May (b)0.01-0.02, Apr. -May (b)0, Apr. -May (a)0.01-0.02, Apr. -May (b)
/(mg?L-1)0, Jun. -Aug. (a)0.01-0.04, Jun. -Aug. (b)0.01-0.02, Jun. -Aug. (b)0, Jun. -Aug. (a)0.01-0.02, Jun. -Aug. (b)
0, Sept. -Nov. (a)0.01-0.04, Sept. -Nov. (b)0-0.02, Sept. -Nov. (b)0, Sept. -Nov. (a)0.01-0.02, Sept. -Nov. (b)
H2S0, Apr. -May (a)0.02-0.05, Apr. -May (b)0-0.03, Apr. -May (b)0, Apr. -May (a)0.01-0.04, Apr. -May (b)
/(mg?L-1)0, Jun. -Aug. (a)0.03-0.07, Jun. -Aug. (b)0.03-0.06, Jun. -Aug. (b)0, Jun. -Aug. (a)0.01-0.07, Jun. -Aug. (b)
0, Sept. -Nov. (a)0.02-0.05, Sept. -Nov. (b)0-0.04, Sept. -Nov. (b)0, Sept. -Nov. (a)0.02-0.04, Sept. -Nov. (b)
Tab.1  Water physicochemical parameters in various investigation sites
investigational sitesmedakatop mouth gudgeonwild goldfishmud loachparadise fishJapanese shrimp
canal from the waterworks05.7 ± 2.310.7 ± 2.53.6 ± 2.1010.6 ± 4.1
sewage canal from the village000000
west side, plants loose03.8 ± 1.42.3 ± 0.815.3 ± 4.800
east side, plants dense34.5 ± 6.4*2.4 ± 0.90.6 ± 0.301.4 ± 0.80
east side, plants loose3.5 ± 1.123.8 ± 5.4*9.6 ± 2.39.8 ± 5.20.4 ± 0.10
canal leading to the sea04.2 ± 2.66.3 ± 1.55.8 ± 2.300
Tab.2  Yields (individuals per net) from the trap nets at different investigational sites
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