EurekaMag.com logo
+ Site Statistics
References:
53,623,987
Abstracts:
29,492,080
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Comparative feeding and physiological energetics of diploid and triploid Sydney rock oysters, Saccostrea commercialis. I. Effects of oyster size



Comparative feeding and physiological energetics of diploid and triploid Sydney rock oysters, Saccostrea commercialis. I. Effects of oyster size



Aquaculture 203(1/2): 177-193



This study assessed the possible physiological bases for the greater growth rates in triploid Saccostrea commercialis over diploid cohorts. Laboratory studies were conducted using rehydrated microalgae, Spongiococcum excentricum, at 2 mg l(-1) to assess the effects of body size (dry soft tissue weight) on the feeding and energetics of juvenile and adult S. commercialis of 2n and 3n ploidy. The parameters clearance rate (CR), absorption efficiency (abs. eff.), pseudofaeces production (PF), respiration (R) and ammonia excretion (E) were measured to determine the energy available for growth and reproduction, defined as scope for growth (SFG). Both diploids and triploids of juvenile and adult S. commercialis were found to have similar SFG, being 4.56 J h(-1) for diploid and 4.81 J h(-1) for triploid 0.01-g oysters, and 21.3 J h(-1) for diploid and 20.8 J h(-1) for triploid 1-g oysters. The only significant differences between the ploidy conditions were in PF and E in adult oysters. However, since PF and E were only minor components of the energy budget, they did not result in any significant difference to SFG. Abs. eff. was inversely related to size in triploid oysters, but not related to size in diploids. CR, PF, absorbed energy (AE), R and E were significantly related to size in exponential relationships. For CR, AE and R, the exponent was low, about 0.3-0.4, indicating marked declines in size-specific rates with increasing oyster size, e.g. AE declined from 605 J g(-1) h(-1) for 0.01-g to 31.6 J g(-1) h(-1) for 1-g diploid oysters. The exponents were negative for PF, indicating a marked decline in relative production of pseudofaeces with size, e.g. PF declined from 23% of filtered particles by 0.01-g oysters to 6% by-1-g diploid oysters. The inorganic content of the pseudofaeces (25-33%) was significantly higher than in the food (5.6%) indicating selectivity during the feeding and ingestion processes. While this study found no differences in the influence of size on SFG in diploid and triploid S. commercialis at a standard level of food, it is possible that the feeding and energetics of diploid and triploid oysters vary according to food regime. There is also the possibility that diploids and triploids partition their SFG energy in different proportions between the compartments of the body. These two possible differences between the ploidy conditions as bases for different growth rates are considered in a companion study.

Accession: 003685263

Download citation: RISBibTeXText

DOI: 10.1016/s0044-8486(01)00622-6

Download PDF Full Text: Comparative feeding and physiological energetics of diploid and triploid Sydney rock oysters, Saccostrea commercialis. I. Effects of oyster size



Related references

Comparative feeding and physiological energetics in diploid and triploid Sydney rock oysters (Saccostrea commercialis): II. Influences of food concentration and tissue energy distribution. Aquaculture 203(1-2): 195-216, 2001

Studies on triploid oysters in Australia: effect of initial size on growth of diploid and triploid Sydney rock oysters, Saccostrea commercialis (Iredale & Roughley). Aquaculture Research 30(1): 35-42, 1999

Studies on triploid oysters in Australia. X. Growth and mortality of diploid and triploid Sydney rock oysters Saccostrea commercialis (Iredale and Roughley). Journal of Shellfish Research 17(4): 1115-1127, 1998

Studies on triploid oysters in Australia. VI. Gonad development in diploid and triploid Sydney rock oysters Saccostrea commercialis (Iredale and Roughley). Journal of Experimental Marine Biology and Ecology 197(1): 101-120, 1996

Studies on triploid oysters in Australia. XI. Survival of diploid and triploid Sydney rock oysters (Saccostrea commercialis (Iredale and Roughley)) through outbreaks of winter mortality caused by Mikrocytos roughleyi infestation. Journal of Shellfish Research 17(4): 1129-1135, 1998

Studies on triploid oysters in Australia. XII. Gonad discolouration and meat condition of diploid and triploid Sydney rock oysters (Saccostrea commercialis) in five estuaries in New South Wales, Australia. Aquaculture 171(3-4): 181-194, 1999

Studies on triploid oysters in Australia. I. The farming potential of triploid Sydney rock oysters Saccostrea commercialis (Iredale and Roughley). Aquaculture 126(3-4): 243-255, 1994

Studies on triploid oysters in Australia I The farming potential of triploid Sydney rock oysters Saccostrea commercialis. Aquaculture 137(1-4): 356, 1995

Studies on triploid oysters in Australia. XIII. Performance of diploid and triploid Sydney rock oyster, Saccostrea glomerata (Gould, 1850), progeny from a third generation breeding line. Aquaculture 26 233(1-4): 93-107, 2004

Studies on triploid oysters in Australia: evaluation of cytochalasin B and 6-dimethylaminopurine for triploidy induction in Sydney rock oysters Saccostrea commercialis (Iredale and Roughley). Aquaculture Research 27(9): 689-698, 1996

Experimental feeding of Sydney rock oysters (Saccostrea commercialis). 2. Protein supplementation of artificial diets for adult oysters. Aquaculture, 321-2: 1-9, 1983

Experimental deepwater culture of the Sydney rock oyster (Crassostrea commercialis=Saccostrea cucullata): I. Growth of vertical clumps of oysters (ren). Aquaculture 16(2): 127-140, 1979

The physiological basis for faster growth in the Sydney rock oyster, Saccostrea commercialis. Biological Bulletin 197(3): 377-387, 1999

The physiological basis for faster growth in the Sydney rock oyster, Saccostrea commercialis. Biological Bulletin 197(3): 377-387, 2000

Growth characteristics of Sydney rock oysters Saccostrea commercialis in relation to size and temperature. Journal Of Experimental: 155-168,. 30, 1998