Evaluation of reproductive performances of the common octopus (Octopus vulgaris) reared in water recirculation systems and fed different diets

Abstract The reproductive performance of Octopus vulgaris broodstocks fed two different diets (mixed fish [F group, BW 1,048.14 g] or mixed crustaceans [C group, BW 998.44 g]) was analyzed using an experimental recirculating aquaculture system consisting of a tank equipped with spawning and incubation chambers. A total of 8 females (F1–4; C1–4), and 8 males (M1–M8) were selected. DI of the C group females was significantly (p < 0.05) higher (3.0 ± 0.29%) than the F group (2.16 ± 0.67%). SGR in C group was significantly higher (1.43 ± 0.12%) than the F group (1.18 ± 0.25%). Egg clusters, number of clusters, number of clusters/kg BW, and total length were more favorable in the C group than the F group. The number of clusters/kg BW of C females was 2.5 times higher than that of F females (78.1 ± 6.5 vs 31.1 ± 13.3). The total eggs number, number of eggs/cm, number of eggs/kg BW in the C group were significantly (p < 0.05) higher compared with the F group; the number of eggs/kg BW and paralarvae/kg BW were 5 times higher in the C group (115,928 ± 12,513 C vs 22,109 ± 7912 F and 114,953 ± 12,591 vs 20,729 ± 7104, respectively). Hatching rate of the C group was significantly (p < 0.05) higher compared to the F group.

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Growth and reproductive performance of broodstock shrimp reared in a biosecure recirculating aquaculture system versus a flow-through pond

Aquacultural Engineering ◽

10.1016/s0144-8609(03)00048-7 ◽

2003 ◽

Vol 29 (3-4) ◽

pp. 93-107 ◽

Cited By ~ 25

Author(s):

Clete A. Otoshi ◽

Steve M. Arce ◽

Shaun M. Moss

Keyword(s):

Reproductive Performance ◽

Recirculating Aquaculture System ◽

Recirculating Aquaculture ◽

Aquaculture System ◽

System Versus ◽

Flow Through

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Variation of Water Quality in Fish Farm Using Recirculating Aquaculture System for Fancy Carp

Journal of the Korean Society for Environmental Technology ◽

10.26511/jkset.19.1.5 ◽

2018 ◽

Vol 19 (1) ◽

pp. 37-45

Author(s):

Woo Jin Lee ◽

Seon Woo Baek ◽

Ha Na Seo ◽

Byeong Wook Kong ◽

Deog Gwan Ra ◽

...

Keyword(s):

Water Quality ◽

Fish Farm ◽

Recirculating Aquaculture System ◽

Recirculating Aquaculture ◽

Aquaculture System

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Analysis of microbial community structure in an integrated pond recirculating aquaculture system

Journal of Fishery Sciences of China ◽

10.3724/sp.j.1118.2011.00407 ◽

2013 ◽

Vol 18 (2) ◽

pp. 407-415

Author(s):

Yandan YAO ◽

Gu LI ◽

Ling TAO ◽

Xiaoli LI ◽

Shiyang ZHANG ◽

...

Keyword(s):

Community Structure ◽

Microbial Community ◽

Microbial Community Structure ◽

Recirculating Aquaculture System ◽

Recirculating Aquaculture ◽

Aquaculture System

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Denitrification Control in a Recirculating Aquaculture System—A Simulation Study

Processes ◽

10.3390/pr8101306 ◽

2020 ◽

Vol 8 (10) ◽

pp. 1306

Author(s):

Pedro Almeida ◽

Laurent Dewasme ◽

Alain Vande Wouwer

Keyword(s):

Carbon Source ◽

Carbon Sources ◽

Aquatic Organisms ◽

Operating Conditions ◽

Toxic Substances ◽

Recirculating Aquaculture System ◽

Treatment Technology ◽

Tuning Method ◽

Recirculating Aquaculture ◽

Aquaculture System

The recirculating aquaculture system (RAS) is a land-based water treatment technology, which allows for farming aquatic organisms, such as fish, by reusing the water in the production (often less than 5%). This technology is based on the use of filters, either mechanical or biological, and can, in principle, be used for any species grown in aquaculture. Due to the low recirculation rate, ammonia accumulates in the system and must be converted into nitrate using nitrification reactors. Although less toxic for fish, nitrate can also be further reduced into nitrogen gas by the use of denitrification biofilters which may create several issues, such as incomplete denitrification, resulting in toxic substances, such as nitrite and nitric oxide, or a waste of carbon source in excess. Control of the added quantity of carbon source in the denitrification biofilter is then mandatory to keep nitrate/nitrite concentrations under toxic levels for fish and in accordance with local effluent regulations, and to reduce costs related to wasted organic carbon sources. This study therefore investigates the application of different control methodologies to a denitrification reactor in a RAS. To this end, a numerical simulator is built to predict the RAS behavior and to allow for the comparison of different control approaches, in the presence of changes in the operating conditions, such as fish density and biofilter removal efficiency. First, a classical proportional-integral-derivative (PID) controller was designed, based on an SIMC tuning method depending on the amount of ammonia excreted by fish. Then, linearizing and cascade controllers were considered as possible alternatives.

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