Estimation of genetic parameters of growth traits and genetic gain of F5 generation of scallop Hongmo No. 1

Argopecten irradians concentricus, natively distributed along the Atlantic coast of the United States, has advantages of fast growth, short growth cycle, and high meat yield. It was introduced into China mainland in 1991 and in 2001 its large-scale aquaculture began in the Beibu Gulf area. More than 20 years since the introduction of A. irradians concentricus, as the number of breeding generations increased, the characteristics of the breeding population deteriorated seriously reflected in small individuals, low survival rates, and low meat yields. To solve the problem of germplasm degradation of A. irradians concentricus, this research team hybridized A. irradians concentricus with the scallop Bohai Red in 2016, and successfully obtained hybrid offspring. After four generations of breeding, a new strain of scallop Hongmo No. 1 was obtained. Hongmo No. 1 has the characteristics of a fast growth rate, high survival rate, and high temperature resistance, and has completely adapted to the environment of Beibu Gulf in the south of China, so it has a good prospect of popularization and breeding. Although Hongmo No. 1 has been bred for multiple generations, the genetic parameters of its growth-related traits are unknown and whether it still has breeding potential is unclear. As a result of successive selection in a closed population, genetic parameters varied between different generations of selected strains. Obtaining estimates of genetic parameters and genetic gain of growth-related traits of scallop Hongmo No. 1, which has experienced numerous generations of selection, is of great significance for subsequent breeding. To evaluate the breeding effect of the new scallop strain Hongmo No. 1, this study compared the selected line and a non-selected line in the F4 generation of Hongmo No. 1 and evaluated the genetic parameters and genetic gain of F5 growth-related traits. The results indicated that in the F5 generation of Hongmo No. 1 there was no significant difference in the survival rate between the selected line and the non-selected line (P>0.05), but the growth traits of the selected line were significantly better than those of the non-selected line (P<0.05). The coefficients of variation of quality traits of the two populations of Hongmo No. 1 F5 were 14.60%-28.30%, showing potential for successive selective breeding. The genetic gain of shell length, shell height, shell width, body weight, adductor muscle weight, soft tissue weight, and shell weight in the F5 generation were 7.25%, 7.13%, 4.86%, 25.42%, 31.60%, 27.70%, and 21.29%, respectively. The realized heritability of shell length, shell height, shell width, body weight, adductor muscle weight, soft tissue weight, and shell weight in the F5 generation were 0.37, 0.36, 0.25, 0.36, 0.32, 0.38, and 0.32, respectively, which are moderate levels of heritability. The results of this study showed that the growth traits of the selected line were better than those of the non-selected line, both of which showed a large coefficient of variation for quality traits, moderate mean genetic gain, and medium realized heritability. These results indicate that the genetic improvement of A. irradians concentricus, using first hybridization and then sub-breeding, has achieved good results. These results provide a basis for further breeding of growth traits in scallop Hongmo No. 1

Growth characteristics and production performance analysis of new scallop strain Zihaimo F_4

To assess the production performance of the scallop new strain Zihaimo and provide references for the breeding effect of the new strain,we conducted a research in the same sea area with the same management mode and breeding cycle.By comparing seven traits of scallop farming population including shell length (SL),shell height (SH),shell width (SB),body mass(BW),adductor muscle mass (AW) and shell mass (SW) and survival rate of the new strain Zihaimo F_4 with the Argopecten irradians concentricus,we analyzed their growth characteristics and production performance.The results indicate that the accumulated survival rate of Zihaimo F_4 was 51.32% when it was cultured from October 13~(th) to April 28~(th) of the next year,and the SL was from 1-1.5 mm to 50-60 mm,which was significantly greater than 29.18% of A.irradians concentricus (P<0.01).However,the SL,SH,SB and SW of the two cultivation groups in the same period had extremely significant differences(P<0.01).It is suggested that the growth rate of the new strain Zihaimo F_4 was higher than that of A.irradians concentricus.Compared with A.irradians concentricus,after 6.5 months of cultivation,the SL,SH,SB,BW and AW of the new strain Zihaimo F_4 increased by 19.50%,19.84%,16.23%,56.30% and 20.20%,respectively

一种独立透析充分性监测系统

本实用新型专利公开了一种独立透析充分性监测系统,包括能够搭配完成透析充分性监测的至少一个监测装置与控制台,所述监测装置包括扣合在一起的上壳1、下壳12,所述下壳12上固设有第一极管电路板13、主电路板模块11,所述主电路板模块11上固设有用于监测传输透析机废液口废液数据的分光光度部8,所述分光光度部8包括通过所述分光光度部8中腔连接的进水部与出水部7,所述进水部包括依次连接的进水口金属板6、第一密封垫5、吸收池4、第一胶塞15、光栅14、第二密封垫3,本实用新型监测装置结构体积小、部件组装方便,结构简单且兼容性强