Jul 16 2013
Credit: Evelyn Ame (Philippines)
The photo shows a model of a fish market in which marketing assistances have been strengthened to eliminate traditional layers in the marketing of fishery products
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=8364
Jul 15 2013
Photo credit: Stephanie Kamonro (Rwanda) Review: Abdel Rahman El Gamal
Fish production from capture fishery in Rwanda is not sufficient to meet the local demand and hence the gap between supply and demand is filled by fish imports.
Cage farming (known locally as kareremba) has been found a viable means to increase fish production in Rwanda and hence this activity has been encouraged whereas cages have been recently placed in in Lake Kivu and other lakes in Rwanda.
It is estimated that at least 1% of the Lake Kivu water is used for cage farming that has been supported by PAIGELAC and organized by cooperatives in the neighboring districts of Karongi, Rusizi, Nyamasheke and Rubavu. The Size of cages ranges from 8m3 to 27m3. Cage farming has been also adopted by companies that are operating in Lake Kivu.
Water temperature of Lake Kivu (250C) is considered optimum for Nile tilapia, Oreochromis niloticus which is the species of choice in cage farming in the lake.
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=8336
Jul 14 2013
Credit: Stephanie Kamonro (Rwanda)
The two photos show fishing boats, gears and techniques, as practiced in Lake Kivu. The efficiency of such fishing practices as well as its impacts on fishery stocks in the lake is an issue of concern. The second photo shows the harvesting of fish fry using mosquito nets.
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=8323
Jul 14 2013
Credit: David Humberto Mendoza Ramirez (Peru)
El cultivo de tilapia (Oreochromis sp., tilapia roja) se desarrolla en selva alta y en la costa norte aprovechando las represas y recientemente en jaulas, existe tecnología disponible. El nivel de producción es de mayor escala (más de 50 TM/año) y menor escala (más de 2 MT/año). El principal mercado es el nacional y en una escaza proporción el de exportación. Su desventaja es la informalidad y la limitada competitividad para un acceso estable al mercado de exportación.
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=8313
Jul 14 2013
Credit: Ibrahim Diler (Turkey) Description: Abdel Rahman El Gamal
Rainbow trout (Oncorhynchus mykiss) has been cultured in Turkey since early 1970s, but major developments took place during the 1990s upon its culture in ponds or cages. Currently Turkey became one of the top trout producing countries. Trout is mainly marketed in domestic markets and consumed locally. Based on demands by consumers, restaurants, hotels and factory catering services, a portion of produced trout is processed mainly as filleted or smoked trout as shown in the photos.
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=8302
Jul 11 2013
Credit: Dhaouadi Raouf (Tunisia)
Permanent link to this article: https://fishconsult.org/?p=8293
Jul 11 2013
Credit: Gabriel de Labra and Mrs. Gabriel de Labra (Spain)
The four photos are taken from a detailed presentation on a project titled: “Enjoyment of the Socio- Economic Rights of 1000 Bangladeshi Women through their Social and Economic Empowerment in Comilla and Chandpur”. The Project has been funded by AECID – The Spanish Agency for International Development Cooperation and implemented by BRAC (local NGO) and AIDA Association (Spanish NGO).
The project targeted to improve the quality of life for women and promote sustainable, equitable and participatory development in rural areas of Bangladesh. The project covered Comilla and Chandpur districts. The photos show feed preparation, feeding and fish sampling.
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=8285
Jul 10 2013
Photos’ ownership: Centro Acuicola Huayllampi (Peru)
Credit: Luis Miguel Ayala Carcamo via Wilder Rodriguez Arteaga (Peru)
Description: Luis Miguel Ayala Carcamo and Abdel Rahman El Gamal
The attached photos show the farming of all-male red tilapia, Oreochromis sp. in Poechos Reservoir, Lancones District, Sullana Province, Peru. The reservoir irrigates about 108,000 ha of agricultual lands. It also serves about one million inhabitants of the cities of Piura, Castilla, Paita, Talara and Sullana with water for human consumption. It also enables energy activity of three hydropower plants: Curumuy, Poechos Poechos I and II. Finally, the water reservoir is also used for mining and fisheries.
The cage farming of red tilapia project targets to promote Aquaculture as an alternative activity and job creation, Check the technical and economic feasibility for technology transfer of cage farming, and to promote the full use of dams and/or reservoirs.
The photos show several phases of production from stocking till packing
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=8266
Jul 10 2013
Credit: Samir Majdalini (Lebanon)
[gview file=”http://fishconsult.org/wp-content/uploads/2013/07/A-model-of-Tilapia-culture-in-Lebanon.pdf”]
Permanent link to this article: https://fishconsult.org/?p=8254
Jul 09 2013
Credit: Rodrigo Rivera González (Chile)
Introduction: The current photos illustrate parts of the artificial spawning of Chilean sea urchin using chemicals based on its effectiveness.
There are several physical, chemical and mechanical stimuli which could be used to induce the spawning of sea urchin and the release of gametes.
The procedures related to the photos are described as follows:
Spawning induction: Sea urchins are thoroughly washed using UV sterilized sea water to ensure taking off all epibionts (organisms living on the sea urchin). Each male or female is injected with a syringe via peristomal membrane to the celomic cavity, using 3 ml of potassium chloride (KCl) solution of 0.5 molar.
In order to receive the spawning products, the injected sea urchin are place individually over transparent beaker, with the aboral pore (genital pores) in contact with the filtered/UV treated seawater. Water temperature is maintained at 15 °C.
If the sea Urchins are ripe, the release of gametes will begin immediately after the injection, whereas the yellow-orange color for the gamete (ovules) would determine the female sea urchin while the whitish color will characterize the sperm of the sea urchin male.
While male sea urchin –once identified- will be immediately removed and temporarily maintained, female sea urchins are left for releasing their gametes for about 1 hour and never exceed 2 hours.
Eggs are washed with filtered and UV-treated seawater over 177-um sieves to clean eggs from dirt. The average egg size ranges from 120 – 130 um in diameters.
Because of the short longevity of the sperm (about 30 minutes), the sperm is obtained shortly before fertilization. It is recommended to select the best quality sperm –based on motility and number- via microscopic examination using Sedwegick and Neubauer chambers.
Fecundation (fertilization): Washed eggs are transferred into containers of 10-12 liters whereas about a million ovules are placed in 1-um filtered and UV-irradiated seawater and at 17 – 18 °C.
Fertilization is carried out by adding one ml of sperm solution with approx. 100×106 sperms to the mentioned ovules (1 million) which means a ratio of 100 sperms to each ovule. The sperm solution has 1 ml of concentrate of sperms obtained directly from the gonad of the sea urchins and diluted in a volume of 200 ml. The success of fertilization as well as embryonic development is determined through microscopic examination. After 30 minutes the fertilization, fertilized eggs (embryos) are poured out whereas one-half of the water is changed with fresh, 0.5 um-filtered and UV irradiated seawater at 17-18 °C.
Larval culture: After 24 hours post fertilization, the larvae which are are in gastrula stage, are siphoned from water surface as most of the larvae are swimming while dead/non fertilized eggs stay on the bottom. The larvae are transferred into 50-liter tanks and maintained at 18 °C for 24 hrs, with 1-um filtered and UV sterilized seawater whereas gentle aeration is provided. The larvae remain for a period until they reach the prisma stage. The larvae at this stage are transferred to 500-lt fiber-glass tanks which are supplied with 1-um filtered and UV-irradiated circulating seawater (18 °C). Aeration at the proper level is provided to maintain homogenous culture. The starting density during larval culture is 1.5 – 1.6 larvae/ml. During the larval culture period, periodic sampling for general well-being of the larvae is carried out. Moreover, density estimate is evaluated.
Larval feeding: The feeding is done twice/day directly to the culture tank. The common natural food used is made of a 1:1 mix of Chaetoceros gracilis and Isochrysis galbana. The concentrations of the natural food in the nursing water vary according to the stage of development as follows:
Larval stage Microalgae conc. (cell/ml)
4 arms 30,000
6 arms 40,000
8 arms 50,000
Pre-metamorphic 60,000
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=8237
