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Effects of Environmental Factors and Food on the Energy Budget and Larval Development of Meretrix Meretrix

Author: TangBaoJun
Tutor: LiuBaoZhong;XiangJianHai
School: Graduate School , Chinese Academy of Sciences ( Institute of Oceanography )
Course: Fishery resources
Keywords: Clams Environmental factors Bait Energy budget Larvae Growth and development
CLC: S917
Type: Master's thesis
Year: 2005
Downloads: 198
Quote: 5
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Abstract


1, October 2003, January 2004, studied under laboratory conditions of temperature, salinity clams (shell length 40.32 ± 1.57mm) energy budget. Sample at a given temperature, salinity conditions domesticated 8-10 days, and then measured the filtration rate of the clams, feeding rate, oxygen consumption rate and ammonia excretion rate indicators. 10-25 ° C temperature range, the clam filtration rate of oxygen consumption rate and ammonia excretion rate increased with increasing temperature, the total energy of the feeding and breathing, excretion can increase variance analysis show the effect of temperature. significant (P lt; 0.05) ,10-15 ℃ Q during 10 values ??up to 12.27, but in the range of 15-20 ℃, the change was not significant (P gt; 0.05) Q 10 < / sub> value close to 1, indicating good adaptability to changes in temperature in the 15-20 ° C range clams; salinity of clams treatment rate, oxygen consumption rate and ammonia excretion rate have a significant impact (P lt; 0.05), clams filtration rate in the 16-26 range within the salinity increased with salinity increase in salinity of 26 to obtain the maximum in the the salinity 26-41 range decreases with salinity. Increased salinity 16 (20 ° C) clams oxygen consumption rate and ammonia excretion rate thereafter with salinity decreases, the minimum salinity 26-31.5 (20 ℃), and then with the salinity . Salinity 21-36 range, salinity clams oxygen consumption rate and ammonia excretion rate is not significant (P gt; 0.05). Clams in salinity above or below its optimal salinity tolerance range (21-36), may adjust the osmotic pressure through the organization of protein metabolism to adapt to environmental pressures. Clam intake of total energy to obtain the maximum salinity of 26, respiration and excretion can achieve the minimum salinity 26 is suitable for clam growth salinity range. 2, April 2004, May 2004, studied under laboratory conditions, the three different densities single cell algae species (Phaeodactylum tricornutum Phaeodactylum tricornutum, etc. galbana Isochrysis galbana flat algae Platymonas subcordiformis), of clams the impact of the energy budget. The results showed that the clams filtration rate decreases with increasing food concentration, oxygen consumption rate and ammonia excretion rate increased with increasing food concentration, feeding rate with food concentration change is not obvious that clams by the filtration rate conditions to control the intake of food. Feeding flat the algae (Platymonas subcordiformis) oxygen consumption rate and ammonia excretion rate than feeding Triangle Phaeodactylum and golden algae, clams feeding digestion flat algae consume the energy more. Clam filtration rate, feeding rate, oxygen consumption rate and ammonia excretion rate with organizations dry weight increase and decline, indicating that the small size of clams in the active growth period. Clams of assimilation rate decreased with increasing food concentration, but the difference was not significant (P gt; 0.05), the assimilation rate is little difference between the different specifications clams, but different diets assimilation rate differences in feeding tricornutum algae clams assimilation rate in

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