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Study on the Production of Plankton and the Carrying Capacity of Jellyfish in Pond

Author: ZhangKai
Tutor: TianXiangLi
School: Ocean University of China
Course: Aquaculture
Keywords: The jellyfish farmed Port ponds Phytoplankton Zooplankton Primary productivity Secondary productivity Load force
CLC: S931.1
Type: Master's thesis
Year: 2010
Downloads: 66
Quote: 1
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Abstract

Jellyfish (Rhopilema esculentum) under the Coelenterate door, Scyphozoa root saliva parent mesh, root saliva mother Branch, jellyfish genus missed the film animal zooplankton for food, such as copepods, cladocerans, referral Shaped Cumacea, Amphipoda, ciliates, shellfish larvae. Jellyfish is a large edible jellyfish, low fat content, and rich content of protein and inorganic salts, favored by consumers at home and abroad, with high economic value. In 2006, the National jellyfish total output in China has reached 3.77 × 104 t, has become an important mariculture economy one of the categories. Hong Kong rearing ponds is an important breeding jellyfish, jellyfish breeding Port ponds plankton productivity and jellyfish load of Forces also no relevant reports. Shandong Province, Rongcheng Jing Gulf of jellyfish breeding the Port ponds primary productivity, zooplankton composition, biomass and secondary productivity study, and a preliminary assessment rearing ponds of Hong Kong the jellyfish's load force to Port ponds jellyfish breeding reasonable stocking density and yield determination to provide a scientific basis. 1 jellyfish breeding Hong Kong pond phytoplankton primary production: to black-and-white bottle jellyfish breeding Jinghai Bay Port pond phytoplankton primary productivity. The research results show that, during the 2008 jellyfish breeding, Port ponds phytoplankton primary productivity (gross yield) average 7.15 ± 1.36g02 The / (m2 · d), the highest in August (13.59 ± 4.23) g02 / (m2 · d), the minimum value in October (2.52 ± 0.55) g02 / (m2-d); domestic ponds water content of chlorophyll a mean of 5.99 ± 0.42μg / L, the maximum in August (8.46 ± 0.40μg / L), the minimum in September (4.16 ± 0.17μg / L), is consistent with the primary productivity trends. The pond water body of the content of chlorophyll a mean of 10.01 ± 1.81μg / L, the average outside seawater chlorophyll a content of 1.79 ± 0.27μg / L in 2009. Regression analysis showed that there is a positive correlation between the experimental Port ponds primary productivity and chlorophyll a content. 2 jellyfish breeding Port pond zooplankton secondary productivity and conversion efficiency is estimated pond zooplankton study investigating Kong pond zooplankton species composition and quantity: Shandong Province Rongcheng Jing Gulf jellyfish breeding Port and Port ponds secondary productivity of zooplankton and primary production to the efficiency of the conversion of secondary productivity estimates. The research results show that the Port fishponds and zooplankton off the coast of the dominant species are the copepods special's crooked Daphnia (Tortanus derjugini), abundance range 9.99 ~ 36.49ind / L and 8.80 ~ 133.60ind / L, respectively. Individual daily production quantity fluctuation range of experimental Port Fuman zooplankton in June-October 2008 0.23 ~ 0.32mgC / (ind · d), the average 0.29mgC / (ind d). The fluctuation range of the daily production of zooplankton community to 306.38 ~ 484.50 mgC / (m2 · d), the average for 368.38mgC / (m2 · d). Primary productivity and to zooplankton secondary productivity conversion efficiency from 9.29 to 69.66%, with an average of 31.31%. May to October 2009, experimental farms in zooplankton individual daily production quantity fluctuation range for 0.23 ~ 0.41mgC / (ind · d), the average for the 0.33mgC / (ind · d). Daily fluctuation range of the production of zooplankton community to 118.85 300.66mgC / (m2 · d), the average 209.60mgC / (m2 · d). Primary productivity to the conversion efficiency of the secondary productivity fluctuation range of 5.88-55.90%, with an average of 16.47%. 3 jellyfish breeding Hong Kong pond copepods secondary productivity research: the study of jellyfish breeding Shandong Province, Rongcheng Jing Gulf jellyfish breeding Port ponds copepod biomass changes during the investigation in 2009 on the basis of, the cumulative growth measured jellyfish breeding the Port ponds in copepods secondary productivity. The results show that, between Port ponds copepod biomass changes in the between 28.30 ~ 114.42μg / L, the average 74.72μg / L; the secondary production changes in 7.49 20.47mgC / (m2 · d), the average value 11.96mgC / (m2 · d); average P / B coefficient 0.469. Sea copepod biomass between 27.62 ~ 555.98μg / L, average 193.88μg / L; The copepods production in 4.95 119.90mgC / (m2 · d) between average 43.05mgC / ( m2 · d). The average P / B ratio of 0.556. This study shows that feeding of jellyfish in water copepod biomass and production impact. 4 jellyfish breeding the Port ponds microzooplankton grazing and productivity: Jinghai Bay, Shandong Province, jellyfish breeding Port ponds periodically sampling the dilution method to study the growth rate of the jellyfish breeding ponds phytoplankton, microzooplankton on planktonic the plant feeding rate, grazing pressure of microzooplankton productivity. The research results show that the jellyfish breeding Port ponds microzooplankton relatively simple, jellyfish breeding the micro zooplankton abundance during the end of the below Jellyfish. Among them, the dominant species of jellyfish breeding microzooplankton during the root-like the proposed Suzumushi (Tintinnopsis radix) of 600 to 2600 ind / L Jellyfish after the dominant species intended Suzumushi root-like, Knott's Berry Ma Suzumushi ( the Leprotintinnus nordquisti) and sports bollworm (Codonellopsis mobilis), abundance were 3000 ~ 6000,1500 ~ 3000,1500 ~ 3000ind / L. During the study period, the port ponds phytoplankton growth rate was 0.05 ~ 1.03 d-1. The microzooplankton feeding rate was 0.24-2.37 d-1, the grazing pressure on the phytoplankton from 21.10% to 90.61%, 77.08% -583.68% potential primary productivity of grazing pressure, while microzooplankton secondary productivity accounted for 22.92% to 76.92% of the primary productivity. This study showed that microzooplankton plays an important role in jellyfish breeding Port pond ecosystem material and energy flows. 5 jellyfish food ingestion and conversion efficiency of several biological research: jellyfish (Rhopilema esculentum) ingestion and conversion efficiency of several different food organisms. The research results show that the jellyfish predation rates on different food organisms tends to increase with the increase in the density of food organisms. Food conversion efficiency of jellyfish feeding copepods (special's crooked are Daphnia, Tortanus derjugini) Mongolia Moina (Moina mongolica) and Artemia nauplii (Artemia sp.) 947.62%, 851.3% and 699.4%, respectively. The average daily growth rate of 11.39%, 11.96% and 10.42%, respectively. Comprehensive comparison of feeding copepods the jellyfish feed conversion efficiency highest, while the average daily growth rate was the highest of Moina mongolica 11.96%. Secondary productivity of the pond zooplankton in Hong Kong has to offer jellyfish load force an average of 6.01 × 106kg, obtained by changing the water jellyfish maximum load force of 3.69 × 105kg total of about 6.38 × 106kg.

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CLC: > Agricultural Sciences > Aquaculture, fisheries > Aquatic Resources > Aquatic Resource Science > Fisheries resources in ecology
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