Mar 01 2012

An artisanal fisherman with his catch at Matoso beach in Migori District, Kenya

Credit: Edwin Muga (Kenya)

This photo shows an artisanal fisherman on his sesse canoe with his catch of Nile tilapia, Oreochromis niloticus. The water body shown in the photo is Lake Victoria, the source of the White Nile. In addition to Nile tilapia which is the dominant Tilapine species landed from this water body, there are other key species landed from this fresh water body (Kenya side since it is a shared body between Kenya, Uganda and Tanzania) is Rastrineobola argentia followed by Lates niloticus and the Tilapines, with other species are Clarias gariepinus, protopterus aethiopicus, Haplochromines, Schilbe mystus, Bagrus docmac, mormyrus kannume, and mastacembelus spps. The sesse canoe is built using hard wood timber and is propelled using oars. Fishermen usually go out to set their gill nets using a crew of three. Most of tilapia catch is for local market but the Nile perch, Lates niloticus industry is highly commercial and supplies the local processing factories with fish for filleting and export to the EU market.

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

Permanent link to this article: https://fishconsult.org/?p=2661

Mar 01 2012

Establishing a fingerling production center of gamitana (Colossoma macropomum) in Tingo Maria – Peru (in Spanish)

This project proposal has been developed by a group who participated in Fish Culture Development training course in 2007 under the supervision of Dr. Abdel Rahman El Gamal. The team propsed the establishment of a fingerling production center for gamitana (Colossoma macropomum) in Tingo Maria, Peru. The rationality of species selection, Clossoma has been addressed in the project document. The proposal has also addressed the technical aspects. Similarly, the financial and economic evaluation has been addressed in more details. The project document is supported by illustrations.

[important]Establishing a center for the production of Colossoma fingerlings in Peru (in Spanish)[/important]

 

Permanent link to this article: https://fishconsult.org/?p=2649

Feb 27 2012

Culture of Nile tilapia in integration with banana in Egypt

The two photos cover the overall integrated aquaculture-horticulture project. In this specific project, horticulture is represented by banana while Nile tilapia (Oreochromis niloticus) represents the aquaculture component. Because of water scarcity in Egypt, the surface irrigation of banana farming is not encouraged due to its high water consumption. In order to compromise between the restrictions placed on banana farming especially in some locations and the high marketing potential of banana especially in export markets, drip irrigation has been found the ideal approach in producing banana using minimum quantity of water. Added to that, the integration with aquaculture is a means to magnifying the value of water. The photo “A” shows the water reservoir that receives an allocated quantity of surface water for a banana. The photo “B” shows the mechanical filters used to filter and trap particulates of various types before passing the clean water to the drip irrigation system and ensure a proper function of the system nozzles and protect it from being blocked. In this particular project, it is estimated that the banana requirement of chemical fertilizers is significantly reduced for producing the same quantity of banana. The harmony between banana and fish should consider water requirement by banana, particulates produced in the system due to fish culture and the capacity of the filtration system.

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

[important][/important]

 

Permanent link to this article: https://fishconsult.org/?p=2644

Feb 26 2012

Production performance of a closed aquaculture system for tilapia in Egypt

Credit for the photos: El-Sadig Arbab Hagar (Sudan), Samuel Simon Zigizo (South Sudan) and David Martin Sykora (Paraguay). Credit for the technical information: Ismael Radwan (project owner, Kafr El Sheikh, Egypt)

Photo A-1 shows the whole biological filter for a 240-m3 closed aquaculture project. Photo A-2 shows the plastic rings which are the main substrate in the filter, upon which the nitrifying bacteria (nitrosomonas and nitrobacter) naturally colonize. The pumping capacity of the project as shown in photo B is represented by two 15-kw electric pumps (one pump in operation while the second one is on standby). The discharge capacity of each pump is 6m3/minute which is sufficient to carry out the exchange of water at a rate of once/hour in the 24 production tanks which are hosted by a greenhouse. The water depth in the production tanks is kept at 50 cm to allow a high rate of water exchange having in consideration the pumping capacity of the project. The production capacity of this system ranges from 45 – 50 kg/m3 of 500-g size tilapia after a 6-month growing season when starting with about 5-g fingerlings. Because water used in the project is well water (warm water), and because the relative insulation provided by the greenhouse, more than a production cycle could be attained in a year. Feed used in this project is 32% protein commercial feed.

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

 

Permanent link to this article: https://fishconsult.org/?p=2632

Feb 24 2012

Rigor mortis in fish and its relation to quality

This 4-slide information bite starts with an intoductory slide on the rigor mortis in animal in general including its causes and feautures. The remaining part of the bite focuses more on the rigor mortis in fish having in consideration the specific nature of fish as well as fishing and aquaculture practices. Emphasis has been placed on factors affecting the onset and durations of Rigor Mortis as well as the effects on the quality of fish products.

[important]Rigor mortis in fish[/important]

 

Permanent link to this article: https://fishconsult.org/?p=2620

Feb 24 2012

Bangladesh aquaculture – Sampling of farmed fish

Credit: Mohamed Mahmudun Nabi (Bangladesh)

The two photos show the sampling of farmed fish in a fish farm in Bangladesh. Sampling usually is done on monthly basis using simple gears such as cast net.  Sampling is carried out mainly for feed adjustment, and also for field observation on growth performance and health condition. Typically, a random sample of about 10-20 fish specimens is picked for sampling whereas individual length and weight is taken.

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

[important][/important]

Permanent link to this article: https://fishconsult.org/?p=2614

Feb 21 2012

Possible use of plant compost in aquaculture

Credit of the photos:  Photos used in this information bite have been taken from a pool of photos which was given to me by friends who participated in Warm water fish production during 2009 and 2010. Identified names are: shared with me from El-Sadig Arbab Hagar (Sudan) and Lylian Wilfred Mguhi Lugobola (Tanzania). Thanks to course participants who shared with me 1000s of photos including these one.

This 4-slide bite addresses plant composting from the point of view on its possible use in aquaculture. The principles of composting as well as the requirements have been covered. These included the ratio between carbon to nitrogen in the compost materials, moisture, oxygen as well as other related factors. Examples of carbon-rich as well as nitrogen-rich materials are presented). Based on that, methods of composting which would provide the optimum composting environment has been also addressed. This bite ended by the possible use of plant compost in aquaculture whether in a form of fertilizer or mixed in fish feed. The bite has also some cautions and concerns in relation to the use of compost in aquaculture.

[important]Plant compost and aquaculture[/important]

 

Permanent link to this article: https://fishconsult.org/?p=2598

Feb 14 2012

Los Lunas Silvery Minnow Refugium (Fact sheet)

Credit: Douglas Tave (USA)

This 2-side page illustrated fact sheet provides brief information on the naturalized refugium (the conservation fish culture component) of the Los Lunas Silvery Minnow Refugium, which is located in New Mexico, USA, and which is operated by the New Mexico Interstate Stream Commission. The facility is designed and operated to produce Rio Grande silvery minnow (Hybognathus amarus) which was been listed as endangered in 1994, using conservation aquaculture principles and management. The fact sheet covers the history of the facility as well as its functions, features and cost.

Papers that describe the why conservation fish hatcheries are needed, the design concepts of the naturalized outdoor refugium, how it is operated, how it was transformed from sterile concrete and soil into a conservation unit, and how fish are raised for augmentation can be found in the following publications:

Tave, D., G. Haggerty, C.N. Medley, A.M. Hutson, and K.P. Ferjancic.  2011.  Los Lunas silvery minnow refugium:  a conservation hatchery.  World Aquaculture 42(2):28-34, 67.

Coleman, R., A.M. Hutson, L.A. Toya, and D. Tave.  2011.  Using native plants to provide natural ecosystem functions in a conservation fish hatchery.  Native Plants Journal 12:216-225.

Hutson, A.M., L.A. Toya, and D. Tave.  2012.  Production of the endangered Rio Grande silvery minnow, Hybognathus amarus, in the conservation rearing facility at the Los Lunas Silvery Minnow Refugium. Journal of the World Aquaculture Society 43:84-90.

[important]Refugium fact sheet v 2 (2)[/important]

 

Permanent link to this article: https://fishconsult.org/?p=2592

Feb 13 2012

Bangladesh aquaculture – Fish pond management (Fish feeding)

Credit: Mohamed Mahmudun Nabi (Bangladesh)

Fish feeding: The three photos show systems of fish feeding in Bangladesh aquaculture. The main types of fish feeding are represented in  home-made fish feed and commercially manufactured feed. In regard to home-made feed, feed ingredients used include rice bran, wheat bran, mustard oil cake, fish meal etc. One of the pictures shows a possible role in the preparation of home-made fish feed.

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.



Permanent link to this article: https://fishconsult.org/?p=2582

Feb 13 2012

Bangladesh aquaculture – Fish pond preparation (liming)

Credit: Mohamed Mahmudun Nabi (Bangladesh)

This photo shows the liming of a fish pond in Bangladesh. After the de weeding and repairing the dikes and bottom of the pond, liming is considered the next important work for pond preparation. Farmers usually use calcium carbonate (CaCo3 as solid limestone. Before its use, limestone needs to be sink in an earthen, cemented or metallic tank for dilution. The application dose is normally 250 kilogram/ha.

Note: We decided not to watermark the photos in order not to upset its clarity. However, we trust you will notify us if you wish to use a picture or more. This is expected and will be appreciated.

 

Permanent link to this article: https://fishconsult.org/?p=2573

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