scholarly journals Influence of garlic extract on larval performance and survival of juvenile angelfish Pterophyllum scalare during transport

2023 ◽  
Vol 83 ◽  
Author(s):  
D. C. Mattos ◽  
J. V. A. Manhães ◽  
L. D. Cardoso ◽  
P. H. R. Aride ◽  
H. D. Lavander ◽  
...  
Keyword(s):  
Garlic Extract ◽  
Larval Performance ◽  
Growth Promoter ◽  
Trial Period ◽  
Input And Output ◽  
Aquaculture System ◽  
Recirculation Aquaculture System ◽  
New Research ◽  
Pterophyllum Scalare

Abstract The objective of this study was to evaluate the properties of garlic as a growth promoter in larvae of angelfish Pterophyllum scalare and its benefits during transport of juveniles of this species. The experiment was conducted in recirculation aquaculture system, consisting of 20 tanks of 40 L equipped with independent water input and output. We used 1,400 larvae distributed among five treatments, with four repetitions, which totaled 20 experimental units. The treatments were 0, 50, 100, 200, and 400 mg of garlic extract per kilo of feed. The results showed that the inclusion of levels of garlic extract in the feed did not significantly effect the fish’s development or their transport. Neither did the inclusion of levels of garlic extract affect the survival of the larvae during the trial period. New research with extracts of higher dosages should be performed to elucidate the effect of garlic extract as a growth promoter.

scholarly journals Data Acquisition and Alert System for Recirculation Aquaculture System (RAS) using Fog Computing

2019 ◽  
Vol 3 (6) ◽  
pp. 6-10
Author(s):  
Siti Maryam Zainol ◽  
Keyword(s):  
Data Acquisition ◽  
Real Time ◽  
Fog Computing ◽  
Processing System ◽  
Raspberry Pi ◽  
Aquaculture System ◽  
Data Collecting ◽  
Level Sensor ◽  
Recirculation Aquaculture System ◽  
Collecting System

This research presents an improved and more effective approach for data acquisition of recirculation aquaculture system (RAS). The previous research, the system uses manual methods to take the important data from RAS and it wastes the time and also gets late response from the fish farmer if the data is not in the good condition. As a result, fog computing technology is applied to overcome all these problems and acts as advance data acquisition system to keep data safely by sharing the processed data in fog computing for every tanks and analyze the data to make an accurate control/decision in the real time. Besides, open source technology plus embedded system based will be integrated for this research because its benefits such as small size, low cost, light weight, portable, high efficiency and low power consumption. This research has achieved the objectives which are design a data collecting system for RAS, design a data processing system using fog computing and integrate, test and validate automatic data collection and processing strategy for recirculation aquaculture system (RAS). The data collecting system for RAS, RaspDAQ is developed by connecting Raspberry Pi 3 to temperature sensor (LM35DT) using analogue digital converter (ADC) MCP3002, water level sensor (HC-SR04), Rpi camera module, LEDs and buzzer. Software and program are built using Python and Apache server to run every functions of RaspDAQ. While third Raspberry Pi 3 is setup as data processing system, RaspFog using PHP, Apache and MySQL server. Both RaspDAQ and RaspFog are based on Raspbian operating system. After that, RaspDAQ1 and RaspDAQ2 are connected to RaspFog using WiFi technology to send sensors data in real time. The received data are stored and plotted using Highcharts.com graph. The data collecting system, RaspDAQ and data server and processor, RaspFog has been tested and validated. At the same time, users can see the graph output in the real time for temperature, water level sensor and real condition using Rpi camera module of RaspDAQ1 and RaspDAQ2 by browsing RaspFog website. From the observation, data has been transferred from RaspDAQ to RaspFog in a short duration which is less than 15 seconds. Consequently, the efficiency of data acquisition process has been improved from manual system to fog computing technology successfully.

scholarly journals Supplementation of Curcuma longa hydrolate improves immunomodulatory response in Nile tilapia reared in a recirculation aquaculture system

2020 ◽  
Vol 72 (5) ◽  
pp. 1805-1812
Author(s):  
M.O. Pereira ◽  
A.V. Moraes ◽  
J.C.B. Rodhermel ◽  
J.D. Hess ◽  
L. Alves ◽  
...  
Keyword(s):  
Nile Tilapia ◽  
Curcuma Longa ◽  
Dietary Supplementation ◽  
Experimental Unit ◽  
Hepatosomatic Index ◽  
Aquaculture System ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Recirculation Aquaculture System ◽  
Haematological Analysis ◽  
Different Doses

ABSTRACT The objective of this study was to evaluate the effects of dietary supplementation with different doses of Curcuma longa hydrolate on the hematological, immunological and zootechnical parameters of Nile tilapia cultivated in a recirculation system (RAS). Nile tilapia (Oreochromis niloticus) were used, distributed in 16 polyethylene boxes, divided into four treatments: 0.0%; 2.5%; 7.5% and 10.0% of Curcuma longa hydrolate, in quadruplicate. After 45 days of treatment, four fish per experimental unit were anesthetized to remove blood aliquot for hematological and immunological analyzes and dissect the liver to evaluate the hepatosomatic index and final biometry. In the haematological analysis, the fish fed with 2.5% had a higher number of leukocytes, monocytes and lymphocytes than control, while the doses of 7.5% and 10.0% did not differ. Antimicrobial activity showed a significant decrease as the dose of C. longa hydrolate increased. The other hematological, immunological, hepatosomatic index and zootechnical data did not differ between treatments. Thus, supplementation of the hydrolate of Curcuma longa at a dosage of 2.5%, improved and maintained blood-immune homeostasis parameters in these animals, being suggested for further studies.

scholarly journals Influence of repeated intravital extraction of eggs from sturgeon hybrids on their oogenesis under conditions of recirculation aquaculture system

2015 ◽  
Vol 181 (2) ◽  
pp. 191-203
Author(s):  
Olga P. Filippova ◽  
Svetlana V. Piyanova ◽  
Sergey E. Zuevsky
Keyword(s):  
Maturity Stage ◽  
Membrane Thickness ◽  
Huso Huso ◽  
Acipenser Ruthenus ◽  
Aquaculture System ◽  
Sturgeon Species ◽  
Ultrasound Diagnostics ◽  
Recirculation Aquaculture System ◽  
Oocyte Membrane ◽  
Aquatic Complex

Dynamics of cytomorphological characteristics of oocytes in ovaries is considered for two sturgeon hybrids: besters of the breed Burtlevskaya Huso huso (Linnaeus) x Acipenser ruthenus (Linnaeus) and the breed Aksayskaya Acipenser ruthenus x ( Huso huso x Acipenser ruthenus ) on the experimental data obtained under controlled conditions in the aquatic complex in Moscow (Russia) in 2010-2012. Methods of intravital eggs extraction, ultrasound diagnostics, biopsy with the probe, anesthesia and histological analysis are applied. Structure of membrane is similar for straight sturgeon species and hybrids, but the membrane thickness and the term of its emergence on certain maturity stage are somewhat different, so the eggs of bester could be distinguished by the oocyte membrane thickness. Mean interspawning interval for the hybrids in conditions of recirculation aquaculture system at water temperature 20-21 °C is determined as 10-12 months.

scholarly journals ADDITION OF SHELTERS TO CONTROL THE PHYSIOLOGICAL RESPONSES AND PRODUCTION OF MUD CRAB Scylla serrata IN RECIRCULATION AQUACULTURE SYSTEM

2020 ◽  
Vol 12 (1) ◽  
pp. 299-310
Author(s):  
Yuni Puji Hastuti ◽  
Priyo Handoyo Wicaksono ◽  
Wildan Nurusallam ◽  
Siska Tridesianti ◽  
Yuli Siti Fatma ◽  
...  
Keyword(s):  
Growth Rate ◽  
Abiotic Factors ◽  
Physiological Responses ◽  
Scylla Serrata ◽  
Growth Responses ◽  
Aquaculture System ◽  
Total Hemocyte Count ◽  
Recirculation System ◽  
Recirculation Aquaculture System ◽  
Mud Crabs

The availability of shelters in a specific density is expected to increase the production of mud crabs (Scylla serrata) in a recirculation system. Shelter, as one of the abiotic factors, plays a pivotal role in reducing death caused by cannibalism of crab and suppressing the stress levels of biota. Recirculation Aquaculture System (RAS), with the culture box capacity 60 L supported by the shelters, is predicted to produce the best physiological and growth responses of mud crabs. This present study aims to evaluate the effect of shelter addition in the environmental recirculation system on the physiological responses and production of mud crabs S. serrata with a density of 10 crabs per one culture box containing 60 L of seawater. The research was set up with three treatments of shelter addition, i.e., two shelters (S2), four shelters (S4), six shelters (S6), and control without shelter (C). Results showed that S6 was the best treatment with a survival rate of 73.33 ± 5.8%, a specific growth rate of 0.886 ± 0.014%, the growth rate of carapace width 0.024 ± 0.004 cm/day, and the lowest feed conversion ratio than those of other treatments. S6 treatment significantly influenced the total hemocyte count of crabs at the early cultivation (P <0.05). Addition of six shelters could optimize the growth of mud crabs with a stocking density of 10 crabs in one culture box. 

scholarly journals Comparison of Growth for Cultivated Common carp, Cyprinus carpio Larvae between Earthen Ponds and Recirculation Aquaculture System

2021 ◽  
Vol 34 (1) ◽  
pp. 192-205
Author(s):  
Ahmed M. Mojer ◽  
Majid M. Taher ◽  
Riyadh A. Al-Tameemi
Keyword(s):  
Common Carp ◽  
Specific Growth ◽  
Feed Conversion ◽  
Daily Growth ◽  
Relative Growth ◽  
Common Carp Cyprinus Carpio ◽  
Aquaculture System ◽  
Earthen Ponds ◽  
Carp Cyprinus Carpio ◽  
Recirculation Aquaculture System

A comparison was conducted for growth criteria of common carp, Cyprinus carpio larvae cultivated in earthen ponds and recirculation aquaculture system (RAS) depending on live foods (phytoplankton and zooplankton stimulated by buffalo fertilizers in earthen ponds, while the larvae cultivated in RAS were feed on Artemia larvae reproduced in vitro, in addition to manufactured pellets (38% crude protein) for common carp in both systems. Three 2500 m2 earthen ponds were cultivated for 90 days with larvae of initial weight 0.002 g at different numbers (40800 larvae for pond 1, 55600 larvae for pond 2 and 36400 larvae for pond 3). These larvae depend on natural food for 19 days, then fed on manufactured feed. Fishes were weighed every 19 days to change daily feed. Three replicates of RAS plastic tanks (100 letter capacity) cultivated for 90 days with 0.002 g larvae at a density of 2 larvae per one liter (160 larvae at each plastic tank). These larvae fed for 15 days to saturation (4 meals daily) with Artemia larvae and small Artemia, then fed on manufactured feed. Subsequently, fishes were weighed every 15 days to change daily feed. Larvae cultivated in earthen ponds recorded weight gain of 26.90 g, daily growth of 0.30 gday-1, relative growth of 1345000%, specific growth of 10.56 %day-1, feed conversion of 1.25 and survival rate of 13.16%. Larvae cultivated in RAS system recorded weight gain of 1.53 g, daily growth of 0.02 gday-1, relative growth of 76200%, specific growth of 7.37 %day-1, feed conversion of 2.82 and survival rate of 72.32%. Statistical analysis of results revealed significant differences (p>0.05) in all growth criteria for larvae cultivated in both systems. Final conclusion that earthen pond was better than RAS systems in producing fingerlings of common carp.

The Usefulness of Massive Multiplayer Online Role Playing Games (MMORPGs) as Tools for Promoting Second Language Acquisition

2018 ◽  
pp. 244-268
Author(s):  
Daniel H. Dixon ◽  
MaryAnn Christison
Keyword(s):  
Second Language ◽  
Second Language Acquisition ◽  
Language Acquisition ◽  
Role Playing ◽  
Collaborative Problem Solving ◽  
Target Language ◽  
Collaborative Problem ◽  
Role Playing Games ◽  
Input And Output ◽  
New Research

The purpose of this chapter is twofold (1) to review the benefits of online videogames for promoting second language acquisition (SLA), specifically massive multiplayer online role-playing games (MMORPGs) and (2) to present new research that seeks to explain why and how MMORPGs may be beneficial. The findings from the research indicate that MMORPGs are beneficial to SLA primarily because they provide opportunities for interaction in the target language through participation in collaborative problem solving tasks. The results of the research presented in this chapter show (1) that the requirements of input and output for successful gaming allow for a type of interaction in which the focus on language form leads to modified-output, (2) that players have opportunities to negotiate input as a means of completing in-game tasks, and (3) that in-game tasks are similar to instructional tasks that are believed to be beneficial for SLA in the context of a classroom.

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