Passive greenhouse heating, recirculation, and nutrient addition for nursery phase Tridacna gigas: growth boost during winter months

The impetus for this study was winter-related mortality of juvenile Tridacna gigas along Australia's Great Barrier Reef. Heating nursery tank water by passive solar heating in a greenhouse and the addition of dissolved inorganic nitrogen (DIN) was assessed for effect on the growth and survival...

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Veröffentlicht in:Aquaculture 1992-11, Vol.108 (1), p.29-50
Hauptverfasser: Braley, Richard D., Sutton, David, Mingoa, S. Suzanne M., Southgate, Paul C.
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Mingoa, S. Suzanne M.
Southgate, Paul C.
description The impetus for this study was winter-related mortality of juvenile Tridacna gigas along Australia's Great Barrier Reef. Heating nursery tank water by passive solar heating in a greenhouse and the addition of dissolved inorganic nitrogen (DIN) was assessed for effect on the growth and survival of cultured juvenile clams. Two age classes of T. gigas were used, with means of 1.2 cm and 17.0 cm shell length. Treatments consisted of nutrient-spikes of 20 μ M and 40 μ M ammonium chloride daily or on alternate days, plus s spike of 2.3 μ M phosphate once per week vs. controls without nutrient addition. Three rearing systems were used: (1) recirculating water enclosed in a greenhouse; (2) flow-through water enclosed in a greenhouse; (3) flow-through water with ambient conditions. In the older clams growth in weight was best in system 2, while growth in shell length (SL) was best in system 1, and DIN treatments significantly increased growth compared with controls. In the younger clams, growth in SL was best in system 1. DIN treatments produced significantly greater growth than controls, but there was no difference between 20-μ M and 40-μ M treatments. Survival was 100% for larger clams but for smaller clams mean survival was highest overall in system 1, while 20-μ M DIN treatments within systems produced the best overall survival. The highest levels of DIN in the nursery tanks were found in the 40-μ M DIN treatments, particularly in system 1. The wet tissue weight/shell length ratio for 40-μ M DIN treatments was highest in system 1 and decreased in systems 2 and 3, while controls were similar. Dry shell weight/shell length was highest in the 40-μ M DIN treatment over the control in system 1 only. The zooxanthellae index (no. of algal cells/g clam) was significantly higher in the 40-μ M DIN treatment than in the control in all three systems. Biochemical analysis of whole animals showed higher carbohydrate content in system 2 and in treatments receiving 20 μ M DIN. Tissue protein content did not differ significantly between systems but increased with increasing nutrient concentration. Lipid content was highest in system 1 and decreased with increasing nutrient concentration. Tissue water content of clams at the 20-μ M DIN level was lower than clams in other treatments, indicating superior condition. The combination of passive solar heating, recirculated water, and nutrient addition for the giant clam land nursery phase opens possibilities for culture of this tropic
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Suzanne M. ; Southgate, Paul C.</creator><creatorcontrib>Braley, Richard D. ; Sutton, David ; Mingoa, S. Suzanne M. ; Southgate, Paul C.</creatorcontrib><description>The impetus for this study was winter-related mortality of juvenile Tridacna gigas along Australia's Great Barrier Reef. Heating nursery tank water by passive solar heating in a greenhouse and the addition of dissolved inorganic nitrogen (DIN) was assessed for effect on the growth and survival of cultured juvenile clams. Two age classes of T. gigas were used, with means of 1.2 cm and 17.0 cm shell length. Treatments consisted of nutrient-spikes of 20 μ M and 40 μ M ammonium chloride daily or on alternate days, plus s spike of 2.3 μ M phosphate once per week vs. controls without nutrient addition. Three rearing systems were used: (1) recirculating water enclosed in a greenhouse; (2) flow-through water enclosed in a greenhouse; (3) flow-through water with ambient conditions. In the older clams growth in weight was best in system 2, while growth in shell length (SL) was best in system 1, and DIN treatments significantly increased growth compared with controls. In the younger clams, growth in SL was best in system 1. DIN treatments produced significantly greater growth than controls, but there was no difference between 20-μ M and 40-μ M treatments. Survival was 100% for larger clams but for smaller clams mean survival was highest overall in system 1, while 20-μ M DIN treatments within systems produced the best overall survival. The highest levels of DIN in the nursery tanks were found in the 40-μ M DIN treatments, particularly in system 1. The wet tissue weight/shell length ratio for 40-μ M DIN treatments was highest in system 1 and decreased in systems 2 and 3, while controls were similar. Dry shell weight/shell length was highest in the 40-μ M DIN treatment over the control in system 1 only. The zooxanthellae index (no. of algal cells/g clam) was significantly higher in the 40-μ M DIN treatment than in the control in all three systems. Biochemical analysis of whole animals showed higher carbohydrate content in system 2 and in treatments receiving 20 μ M DIN. Tissue protein content did not differ significantly between systems but increased with increasing nutrient concentration. Lipid content was highest in system 1 and decreased with increasing nutrient concentration. Tissue water content of clams at the 20-μ M DIN level was lower than clams in other treatments, indicating superior condition. 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Treatments consisted of nutrient-spikes of 20 μ M and 40 μ M ammonium chloride daily or on alternate days, plus s spike of 2.3 μ M phosphate once per week vs. controls without nutrient addition. Three rearing systems were used: (1) recirculating water enclosed in a greenhouse; (2) flow-through water enclosed in a greenhouse; (3) flow-through water with ambient conditions. In the older clams growth in weight was best in system 2, while growth in shell length (SL) was best in system 1, and DIN treatments significantly increased growth compared with controls. In the younger clams, growth in SL was best in system 1. DIN treatments produced significantly greater growth than controls, but there was no difference between 20-μ M and 40-μ M treatments. Survival was 100% for larger clams but for smaller clams mean survival was highest overall in system 1, while 20-μ M DIN treatments within systems produced the best overall survival. The highest levels of DIN in the nursery tanks were found in the 40-μ M DIN treatments, particularly in system 1. The wet tissue weight/shell length ratio for 40-μ M DIN treatments was highest in system 1 and decreased in systems 2 and 3, while controls were similar. Dry shell weight/shell length was highest in the 40-μ M DIN treatment over the control in system 1 only. The zooxanthellae index (no. of algal cells/g clam) was significantly higher in the 40-μ M DIN treatment than in the control in all three systems. Biochemical analysis of whole animals showed higher carbohydrate content in system 2 and in treatments receiving 20 μ M DIN. Tissue protein content did not differ significantly between systems but increased with increasing nutrient concentration. Lipid content was highest in system 1 and decreased with increasing nutrient concentration. Tissue water content of clams at the 20-μ M DIN level was lower than clams in other treatments, indicating superior condition. The combination of passive solar heating, recirculated water, and nutrient addition for the giant clam land nursery phase opens possibilities for culture of this tropical bivalve in subtropical zones or in the tropics distant from the ocean.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/0044-8486(92)90317-E</doi><tpages>22</tpages></addata></record>
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subjects Animal aquaculture
Animal productions
Biological and medical sciences
Ecology
Fundamental and applied biological sciences. Psychology
Invertebrate aquaculture
Marine
Mollusca
Shellfish
Tridacna gigas
title Passive greenhouse heating, recirculation, and nutrient addition for nursery phase Tridacna gigas: growth boost during winter months
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