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Studies on Intraspecific Hybridization and Effects of Environmental Factors on Growth and Survival of Sea Cucumber Apostichopus Japonicus Selenka

Author: HuMeiYan
Tutor: LiZuo
School: Ocean University of China
Course: Hydrobiology
Keywords: Sea cucumber Hybridization Grow Heterosis Salinity Temperature Salinity tolerated
CLC: S917.4
Type: Master's thesis
Year: 2009
Downloads: 92
Quote: 2
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Abstract


1 China thorn participate in the growth of the Japanese red sea cucumber hybrids generation material compared to the Chinese sea cucumber, red sea cucumber and Japan four combinations of hybridization and selfing experimental fertilization rate for each experimental group, hatching, larvae and the juvenile the ginseng stage of growth as well as the hybrid offspring heterosis. The results showed that the the hybrid group fertilization rate, hatching rate were lower than selfing group, but by the one-way ANOVA analysis showed no significant difference (P gt; 0.05); ♀ × red sea cucumber, Japanese, Chinese sea cucumber the ♂ hybridization group (JC the other three groups) were greater than the average in the larval and juvenile parameters of the growth traits and showed significant differences; heterosis of the body length and weight of the Japanese red sea cucumber ♀ × Chinese sea cucumber ♂ group (JC) rate is more obvious, the larval body length and juvenile parametric length, weight heterosis rate between 4.60% to 6.90%, from 8.39% to 18.85% and from 23.21% to 49.77%; the China stichopus ♀ × Japanese Red thorn parameters ♂ group (CJ) heterosis rate after 160 days showed positive. The different results of the orthogonal and anti-cross hybrids generation phenomenon may be related to maternal effects, sex linkage and cytoplasmic genetic. Holding culture in different temperature and salinity under juvenile parameters salinity tolerance of sea cucumber in nine different temperature, salinity combination of conditions, that is, three temperature gradient (23, 25, 27 ° C) × 3 salinity gradient the (25,30,35 ‰), transition 3 weeks. Then, two ways to detect salinity tolerated juvenile parameters: 1) the salinity gradient per hour increased or decreased by 2 ‰; 2) the salinity of the mutation, the juvenile parameters transferred to a high-salt (32-46 ‰) or low salinity (9-25 ‰) environment. Experiment were detected the CSMax (highest critical salinity) CSMin (minimum critical salinity), the USTL (salinity tolerance upper limit) and LSTL (lower salinity tolerance) and detected the salinity mutation experiments LS50 (median lethal salinity). The experimental results show that the USTL and LSTL with salinity CSMax, CSMin a positive correlation was negatively correlated with temperature. The CSMax value than the USTL value 6.2-10.0 ‰ CSMin value than LSTL low 5.5-8.5 ‰ This indicates that the salinity gradient lead to relatively wide salinity tolerance range of juvenile parameters, the salinity of the mutation leads to juvenile parameters of salinity The tolerance range is relatively narrow. Two-way ANOVA analysis showed that the salinity and temperature on juvenile ginseng 50% CSMax 50% CSMin, USTL and LSTL significant effects (p lt; 0.001). The experimental results for the sea cucumber aquaculture provides important ecological information. 3 different temperature and salinity combinations on the growth and survival of juvenile parameters of 16 combinations of four temperature gradient (21,23,25,27 ℃) with four salinity gradient (28,31,34,37 ‰) The culture of juvenile parameters under the conditions the 40d, the detection the juvenile parameters of growth and survival. The results show that the higher survival of juvenile parameters in the temperature of 21-25 ° C, within a salinity range of 28-31 ‰; (28-37 ‰) at the temperature of 21-23 ° C, as well as all the salinity gradients within juvenile parameters The specific growth rate, suggesting that juvenile parameters of growth is affected by temperature larger within the appropriate range of different salinity levels on growth basically no effect; temperature of 21-23 ° C, 28-31 ‰ salinity higher growth and survival rates of juveniles within the range of parameter.

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CLC: > Agricultural Sciences > Aquaculture, fisheries > Aquatic basic science > Aquatic Biology > Aquatic Zoology
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