Study on Resource Conservation of Chinese Sucker( Myxocyprinus asiaticus)

Chinese sucker( Myxocyprinus asiatius) is a national secondary protection animal in China,as well as unique economic fish in China having extremely important scientific research value and edible value. With the aggravation of water pollution and the massive construction of water conservancy and hydropower projects,the natural spawning ground of Chinese sucker has been seriously damaged. The current number of wild resources has decreased sharply,and the decreasing trend is continuing. This paper summarized the current resource status and monitoring and assessment methods of Chinese suckers,and put forward the research prospect,so as to provide theoretical reference and technical support for resource protection and development and utilization of Chinese sucker in China.

Experimental Study on the Disease-preventing Model of Culturing Chinese Sucker( Myxocyprinus asiatius) in River Crab( Eriocheir sinensis) Pond

From 2015 to 2016,the hepatopancreatic lesion syndrome had a higher mortality rate,which caused great economic losses to farmers. In order to study the high-efficiency disease-preventing crab pond intercropping mode,an experiment was successfully conducted to intercrop Chinese sucker( Myxocyprinus asiaticus) in a crab pond in 2017. We optimized the traditional stocking mode,and mainly cultured river crabs when intercropping Chinese suckers. Meanwhile,the cultivation environment was strengthened,and the test pond was not affected by disease throughout the year. The results showed that the production benefits were river crab 115 620 yuan/hm^2,Chinese sucker 44 280 yuan/hm^2,and silver carp and bighead carp 5 418 yuan/hm^2,with a total output of 165 318 yuan/hm`2,and the output-input ratio was 1∶ 1. 72. The Chinese sucker-intercropping river crab culture mode promoted the improvement of pond culture environment,effectively controlled the occurrence of hepatopancreatic lesion syndrome,and significantly improved the economic benefits of crab pond culture.

Study on Nutritional Requirement of Chinese Sucker(Myxocyprinus asiaticus)

Chinese sucker( Myxocyprinus asiatius) is a kind of unique fish in China,as well as a kind of national secondary protection animal.With the artificial propagation and fingerling rearing technology getting mature,adult fish culture is becoming more and more mature.This paper summarized the research results of the nutritional needs of Chinese sucker in recent years,and put forward the development direction,so as to provide reference for the development of Chinese sucker culture industry.

Advances on Immunological Effect of Chinese Herbal Preparations on Shrimps

Shrimp culture industry in China has been severely constrained by shrimp diseases,causing great economic losses.Controlling shrimp disease through immunological methods has become a research hotspot.This paper summarized the research results of Chinese herbal medicines on improvement of shrimp immunity in recent years,and put forward the research direction of fishery Chinese herbal preparations in the future,in order to provide technical reference for shrimp culture industry.

Impact of two different types of El Nino events on the Amazon climate and ecosystem productivity

Aims The Amazon basin plays an important role in the global carbon budget.Interannual climate variability associated with El Nino can affect the Amazon ecosystem carbon balance.In recent years,studies have suggested that there are two different types of El Ninos:eastern-Pacific(EP)El Nino and central-Pacific(CP)El Nino.The impacts of two types of El Nino on the Amazon climate and Amazon ecosystem are analyzed in the study.Methods A composite method has been applied to highlight the common features for the EP-and CP-El Nino events using observational data,IPCC-AR4 model output.Potential impacts of the two different types of El Nino on ecosystem carbon sequestration over the Amazon have been investigated using a process-based biogeochemical model,the Biome–BioGeochemical Cycles model(Biome–BGC).Important Findings Below-normal rainfall is observed year round in northern,central and eastern Amazonia during EP-El Nino years.During CP-El Nino years,negative rainfall anomalies are observed in most of the Amazon during the austral summer wet season,while there is average or above-average precipitation in other seasons.EP-and CP-El Nino events produce strikingly different precipitation anomaly pattern in the tropical and subtropical Andes during the austral fall season:wetter conditions prevail during EP-El Nino years and drier conditions during CP-El Nino years.Temperatures are above-average year round throughout tropical South America during EP-El Nino events,especially during austral summer.During CP-El Nino events,average or slightly above-average temperatures prevail in the tropics,but these temperatures are less extreme than EP year’s temperature except in austral fall.These precipitation and temperature anomalies influence ecosystem productivity and carbon sequestration throughout the Amazon.Using the Biome–BGC model,we find that net ecosystem production(NEP)in the EP-El Nino years is below average,in agreement with most previous studies;such results indicate that the Amazon region acts as a net carbon source to the atmosphere during EP-El Nino years.In the CP-El Nino years,NEP does not differ significantly from its climatological value,suggesting that the Amazon forest remains a carbon sink for the atmosphere.Thus,even if CP-El Nino events increase in frequency or amplitude under global warming climate as predicted in some Global Climate Models,the Amazon rainforest may remain a carbon sink to the atmosphere during El Nino years in the near future.