Video credit: Ismael Radwan (Egypt) – Description: Abdel Rahman El Gamal (Founder of the video channel)
This short video
shows a typical process carried out to checking process of the females of
African catfish (Clarias gariepinus). This selection process is carried out
towards successful spawning whether natural or artificial spawning. Two specimens
have been checked in the video whereas the last one shows higher degree of
readiness as eggs showed up at the reddish genital papilla under slight
pressure on the swollen abdomen. The less ready females as the case with all
species should be given enough time until reaching the ready-to-spawn stage.
Red
wiggler worms (Eisenia fetida) are known by its vermicomposting efficiency
for organic wastes. Through such action, the red wiggler has been
recommended for aquaponics not only because of its vermicomposting efficiency
but also because of its low cost as well as its growing easiness whether on the
aquaponics project itself or acquired from specialized farms.
Introducing healthy worms in sufficient numbers to the
media bed in aquaponics would improve the decomposition of organic wastes
including fish waste accumulating in the media/substrate based grow beds and
hence while lowering the waste accumulation will allow more nutrients to become
available to the plant crops in the system.
In the present video, the red wiggler worms are cultured in a separate small
greenhouse annexed to the aquaponics project.
Photos credit: Marx Perfecto C. Garcia (Philippines)– Review: Abdel Rahman El Gamal (Founder of the website)
The facilities shown in the inserted pictures have been
constructed to enhance the water quality for the marine hatchery shown in the
background. Suez Canal water is the main incoming water to the hatchery.
The concrete canals shown in one of the pictures serve to reduce the incoming turbidity through sedimentation while the sand filters serve to clear the water from the water load of suspended matters. There are ultraviolet units (UV) serve as sterilizers and located behind the sand filters. The whole unit is serving the weaning component of the hatchery. In regard to the larval culture tanks, special UV units are dedicated to further sterilize the water in the larval tanks. The species currently reproduced in the hatchery include gilthead seabream (Sparus aurata), European seabass (Dicentrachus labrax) and whiteleg shrimp (Litopenaeus vannamei). Depending on the market demand, more species have been reproduced earlier in this hatchery including soles and several marine shrimp species.
I filmed this video over few days during my stay in Sharm El
Sheikh last March 2019. Like many of the hotel guests, I saw in this small and
open aquarium an attractive point to stop at and watch the fish especially its
location is in front of hotel restaurants. In order to provide some useful
information from my side, I had to meet Eng. Samir and Mr. Hamdy Aziz from
Stella Di Marie hotel then after I contacted Mr. Abdel Ghany Mohamed from Cairo
(supplier of the ornamental fish).
This 7-year old aquarium received its founder batch of fish
from a pet store in Cairo then subsequent batches were received from fish
suppliers. Also, the koi fingerlings shown in the video indicates the
reproduction of the species in the aquarium.
The main species hosted in this aquarium are Koi carp, fan
tail, gold fish and black stomas. The largest specimens of koi belong to the
original stock received about 7 years before.
The aquarium water is connected to a sand filter whereas
back wash then flush takes place once daily then followed by rinsing for 2
minutes before the discharge goes to the drain that is connected with the drain
of the swimming pools.
I attended the daily feeding around noon and I
have been told that the quantity of the pelleted feed is around 100 g of 2-mm size
and 27% protein.
Photos credit: Asma Sabi (Togo) Description: Abdel Rahman El Gamal (Founder of the website).
The inserted pictures are taken in fish farms in Togo. As typically practiced, the inserted pictures show the integration between tilapia cultured in earthen ponds and poultry grown in chicken house. The fallen manure as well as the uneaten chicken feed enrich the natural food underneath in tilapia pond and would be valuable in minimizing the need for commercial fish feed depending on the density of fish in the pond. In addition to the economic feasibility of this type of integration, the diversified farm products and so the periodic revenues would be reflected in the cash flow of the farm.
Although the design of the poultry house may vary, the essential parameters such as space for each bird and the proper ventilation must be maintained whether the birds are broilers or layers.
Photo credit: Khamis
killei John (South Sudan) – Review: Abdel Rahman El
Gamal (Founder of the website)
The inserted pictures
show specimens of crocodiles cultured in a crocodile farm. In this particular
facility, the culture of crocodiles is done for research purposes.
It may worth noting
that the possible escapee of crocodiles from the farms to the wild represented
always environmental threats.
According to Wocomo Wild life, the largest
crocodile farm in China hosts more than 5000 crocodiles and is located in
Yunnan (Honghe Prefecture). In fact, the hot weather along with good water
quality are supporting the farming of crocodiles in these regions.
In the beginning, crocodile farming which took place in China,
Thailand, Cambodia and other countries targeted the trade of their skins which
are the valuable products. Afterwards, crocodile meat began to be consumed and displayed
in stores and offered in restaurants. In fact, China and Hong Kong are the main importers of crocodile meat.
In addition to skin and meat, Other crocodile parts are also utilized as pharmaceuticals and in traditional medicines.
Video credit: Ahmed
Shaheen – Review: Abdel Rahman El Gamal (Founder of the video channel)
The inserted video
shows the feeding of gilthead seabream broodstock. The size of the feed pellet seems
in a good match with the mouth opening of fed fish. Ideally, fish should be
able to engulf the feed pellet at once. If the pellet size is larger than the
mouth opening of fed fish, feed will be out of the direct consumption by the
fish that have no choice except trying to get their feed requirement through
biting. Doing so, a part of feed nutrients leaches in the water and get lost.
Added to that, fish spend un-necessarily energy upon feeding. The same will be
true when feeding a given size of fish on much smaller size pellets. Moreover,
the cost of small-size pellets is usually higher than larger pellets.
Therefore, if fish can easily consume a given size pellets, it is not advised
to feed much larger or smaller size pellets.
Photo credit: Kevin Fitzsimmons
(USA) – Review: Abdel Rahman El Gamal (Founder of the website)
The ornamental
fish industry in Guyana even small but is relatively active. Live fish are
caught in riverain areas and carried out by licensed collectors who use craft
powered by outboard engines, and varying types of fishing gear
(dragnets/seines, dipnets, pin-seines). Typically, the catch is sold to named
exporters of ornamental fish whereas the fish are exported mainly to the U.S.A.
as well as to Canada and Europe. The
main fish species caught and traded in Guyana include the “lemon fin”, the “busty
nose” and “the “red tail pleco”.
It may
worth noting that in Guyana, the Iwokrama
International Centre in partnership with the North Rupununi District
Development Board has been working to develop a sustainable, community-based
aquarium fisheries business in the Rupununi wetlands, central Guyana. The
project has been designed to generate revenue for indigenous communities
especially from the area’s extraordinarily high fish diversity.
Video credit: Elsadig Arbab
(Sudan) – Description:
Elsadig Arbab and Abdel Rahman El Gamal (Founder of the video channel)
The hatchery shown in the video is located
in Toledo, San Jose (Brazil). This particular hatchery is a component of an
aquaculture project that consists of around 1000 of small volume/high density
cages (SVHD cages) of 1.5 meters for each of length, width and depth.
Tilapia reproduced in the hatchery
is a genetically improved Thai strain of Nile tilapia (Oreochromis niloticus).
Two protocols of sex reversal have been adopted for the production of all-male tilapia fingerlings whether through feeding the newly swim-up tilapia fry on hormonal treated feed using the sex hormone (17 a-Methyltestosterone) orthrough the immersion of the newly hatched fry in hormone solution for 7 to 10 days. The actual fingerling production of the hatchery in 2014 is 5 million fingerlings produced during 8-month operation. However, the maximum capacity of the hatchery is 12 million fingerlings.
Photo credit: Aritra Bera (India) Description: Abdel Rahman El Gamal (Founder of the website)
The
picture shows a batch of collected fingerlings of flathead grey mullet (Mugil
cephalus) in India.
The
published reports state that grey mullet has been farmed extensively cultured
in Bengal, Madras and Kerala since 1947. For production efficiency, the species
has been recommended for culture in polyculture with other finfishes and
prawns.
The
species has been a part of surveys carried out to assess its abundance, seasonal
occurrence and distribution of finfish seed resources. For example, Adyar
Estuary was found to be a good ground for finfish seed collection including
grey mullet. The surveys typically assess the seasonal and percentage
composition of seeds of the collected seeds.
