scholarly journals Integrated multi-trophic aquaculture systems: energy transfers and food web organization in coastal earthen ponds

2020 ◽  
Vol 12 ◽  
pp. 457-470 ◽  
Author(s):  
S Gamito ◽  
H Quental-Ferreira ◽  
A Parejo ◽  
J Aubin ◽  
V Christensen ◽  
...  
Keyword(s):  
Water Quality ◽  
Trophic Groups ◽  
Sustainable Aquaculture ◽  
Diplodus Sargus ◽  
Energy Transfers ◽  
Earthen Ponds ◽  
Southern Portugal ◽  
Japanese Oyster ◽  
Experimental Treatments ◽  
Ecosystem State

Three Ecopath models were built to reproduce 3 experimental treatments carried out in earthen ponds located in Olhão, southern Portugal, to understand the energy transferred and the ecosystem state in integrated multi-trophic aquaculture (IMTA). These earthen ponds behave as simplified ecosystems or mesocosms, with well-defined borders, where the relationships between trophic groups can be described through ecosystem modeling. Different combinations of species were produced in these ponds, corresponding to the 3 treatments: (1) fish, oysters and macroalgae (FOM); (2) fish and oysters (FO); and (3) fish and macroalgae (FM). The managed species were meagre Argyrosomus regius, white seabream Diplodus sargus, flathead grey mullet Mugil cephalus, Japanese oyster Crassostrea gigas and sea lettuce Ulva spp. The results showed that the total amount of energy throughput was 15 to 17 times higher when compared with an equivalent naturalized system. The high biomass and low recycling indicated an immature system with low resilience and low stability that demands high rates of water renewal and aeration to maintain good water-quality levels for finfish production. The addition of oysters and macroalgae in the FOM treatment appeared to improve the water quality, since oysters controlled the excess of phytoplankton produced in the ponds by ingesting a fair amount of the phytoplankton, while the macroalgae helped in the absorption of excess nutrients and created a habitat for periphyton and associated macroinvertebrates. Some ecosystem attributes of the FOM ponds approached the values of the naturalized model, suggesting a possible path towards more sustainable aquaculture.

scholarly journals Effect of stocking density and feeding rate of Oreochromis niloticus on water quality and abundance of phytoplankton in aquaculture earthen ponds

2018 ◽  
Vol 22 (5 (Special Issue)) ◽  
pp. 387-402
Author(s):  
Ahmad M. Azab ◽  
Hassan M. M. Khalaf-Allah ◽  
Abd El-Rahman A. Khattaby ◽  
Ahmed S. M. Sadek ◽  
Enas Galal Mansour ◽  
...  
Keyword(s):  
Water Quality ◽  
Oreochromis Niloticus ◽  
Feeding Rate ◽  
Stocking Density ◽  
Earthen Ponds

scholarly journals Effect of aeration on growth and production of fish in intensive aquaculture system in earthen ponds

2017 ◽  
Vol 15 (1) ◽  
pp. 113-122 ◽  
Author(s):  
T Sultana ◽  
MM Haque ◽  
MA Salam ◽  
MM Alam
Keyword(s):  
Water Quality ◽  
Soil Quality ◽  
Pond Water ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Phytoplankton Production ◽  
Zooplankton Abundance ◽  
Aquaculture System ◽  
Earthen Ponds ◽  
Intensive Aquaculture

An experiment was conducted to assess the effect of aeration using blower on growth and production of tilapia (Oreochromis niloticus) in intensive aquaculture system in six (6) earthen ponds at BAU campus, Mymensingh from May to September, 2016. Treatment 1 (T1) with 3 aerated ponds and Treatment 2 (T2) with 3 non-aerated ponds were designed with similar stocking density (300/decimal) of tilapia. Oxygen supply was ensured by blower for 9 hours daily when oxygen depletion occurs in pond water. Fish growth, pond water and soil quality parameters were sampled and assessed. The DO content in the aerated ponds was higher (7.23 mg/l) from the beginning to the end of experiment compared to non-aerated ponds (2.33 mg/l). There were significant differences (p<0.05) of DO content between two treatments at first and last sampling stages. The higher length (15.64±1.56 cm) and weight gain (143.36±39.33 gm), higher SGR (% per day) for tilapia was (2.54±0.00) found in T1 compared to T2 (2.42±0.00) with significant differences (p<0.05) between two treatments. In addition, the higher production of tilapia was obtained in T1 (9581.87±0.00 kg/ha/100 days) compared to T2 (6490.80±0.00 kg/ha/100 days). The average phytoplankton production was relatively higher in T2 and conversely zooplankton abundance was higher in T1 without any significant differences (p>0.05) between the treatments for the abundances of various groups of phytoplankton and zooplankton. Different water quality parameters were found with the better range in aerated ponds. Various intrinsic relationships between DO and other water quality and weather parameters showed that DO content had negative relationships with rainfall, air pressure and humidity but the relationships were not statistically significant. Moreover, different soil quality parameters of pond sediments were found in ideal range for fish culture in both treatments. These results suggest that aeration can be a potential mechanism of aqua-farming to enhance the growth and production of tilapia and DO content in pond water synchronizing other water quality parameters in ponds.J. Bangladesh Agril. Univ. 15(1): 113-122, January 2017

Effects of sodium chloride on water quality and growth of Oreochromis niloticus in earthen ponds

2005 ◽  
Vol 9943 (3) ◽  
pp. 170-176
Author(s):  
David Liti ◽  
Jonathan Munguti ◽  
Norbert Kreuzinger ◽  
Helmut Kummer
Keyword(s):  
Water Quality ◽  
Sodium Chloride ◽  
Oreochromis Niloticus ◽  
Earthen Ponds

scholarly journals Diplodus spp. on artificial reefs of different ages: influence of the associated macrobenthic community

2010 ◽  
Vol 68 (1) ◽  
pp. 87-97 ◽  
Author(s):  
Miguel N. Santos ◽  
Francisco Leitão ◽  
Ana Moura ◽  
Marco Cerqueira ◽  
Carlos C. Monteiro
Keyword(s):  
Benthic Communities ◽  
Fish Populations ◽  
Macrobenthic Community ◽  
Artificial Reefs ◽  
Diplodus Sargus ◽  
Different Ages ◽  
Management Plans ◽  
Southern Portugal ◽  
Density And Biomass ◽  
A Site

Abstract Santos, M. N., Leitão, F., Moura, A., Cerqueira, M., and Monteiro, C. C. 2011. Diplodus spp. on artificial reefs of different ages: influence of the associated macrobenthic community. – ICES Journal of Marine Science, 68: 87–97. Although artificial reefs (ARs) have been deployed and studied worldwide, few studies have attempted to link the benthic community to fish populations. Three AR fish species (Diplodus bellottii, D. sargus, and D. vulgaris) were tested for the influence of the macrobenthic community at three similar ARs deployed in 1990, 1998, and 2002 off the Algarve (southern Portugal). Diplodus sargus density and biomass differed across ARs, and for D. bellottii and D. vulgaris, higher densities and biomass were observed between the oldest and the youngest ARs. The total available benthic biomass did not differ across habitat age, but the composition of macrofauna differed between older and the most recently deployed AR. The results underscore the importance of within-reef-age benthic composition variability as a determinant factor in structuring local fish populations. As the Algarve AR complex consists of reefs deployed at different times and having different benthic communities, management needs to focus more effort on conserving entire habitats rather than exclusively on maintaining the sustainability of fish resources. Hence, management plans for these areas need to be developed on a site-specific basis, according to the fish and macrobenthic community specificities.

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