Mar 03 2014
Credit: Ismael Radwan (Egypt) The photo shows the facilities what are in use during the hormonal treatment of Nile tilapia, Oreochromis niloticus. One may notice that the relatively small size of tanks which enables the matching with the possible number of treated tilapia fry keeping in mind that the fecundity of Nile tilapia (no. eggs/female) …
Permanent link to this article: https://fishconsult.org/?p=10472
Mar 03 2014
Source: www.fishconsult.org The video was taken in the Sea World, San Diego, USA Review: Abdel Rahman El Gamal (Founder of the website and video channel) General: The short-nosed unicornfish (Naso brevirostris) which belongs to the family Acanthuridae has other names including spotted unicornfish, and brown unicornfish. In general, it is a very peaceful fish whether in the wild …
Permanent link to this article: https://fishconsult.org/?p=10469
Mar 02 2014
Credit: Manuel Cano Alfaro (Guatemala) The photos show the use of nymph as a substrate for the production of the earthworm. The use of worms allows the production of compost and simultaneously stabilizes the presence of heavy metals and some other chemicals which could present in the plants. The role of the earthworm stops at …
Permanent link to this article: https://fishconsult.org/?p=10462
Mar 01 2014
Salinity measurement could be determined through several approaches including the refractive index using refractometers. The principle of the refractive index is based on the light refraction through liquids; the more dissolved solids in water, the slower light travels through it. The amount of bending (refraction) is related to how much salt is dissolved in the …
Permanent link to this article: https://fishconsult.org/?p=10452
Feb 28 2014
Credit: Glenda Vélez Calabria (Colombia) The recovery plan of the European eel, Anguilla anguilla, includes an review of the creels that had been previously placed in the National and Natural Park Doñana as well as also in the Guadiamar Green Corridor. This activity is carried out in order to keep track of the biological conditions …
Permanent link to this article: https://fishconsult.org/?p=10449
Feb 27 2014
Credit for the photos: Ismael Radwan (Egypt) The photos show simple fishing gears (traps) which are made of locally available materials. Trapping is a favored fishing practice to artisanal fishermen especially whenever fishery stocks are abundant as well as when the right location for placing the traps is chosen. This is in addition to the …
Permanent link to this article: https://fishconsult.org/?p=10446
Feb 27 2014
Photo credit: Ismael Radwan (Egypt) Description: Abdel Rahman El Gamal Tilapia fingerlings when reaching a weight of about 15-20 grams can be sexed by looking at the genital papilla which is located behind the anus. The genital papilla has a single opening in males (for urine and milt) while females have two openings; one for …
Permanent link to this article: https://fishconsult.org/?p=10435
Feb 25 2014
Credit: Leon Felipe Alviz (Bolivia) The photo shows a fishing boat in Bolivian water and the capture of leopard catfishes, Perrunichthys perruno using line fishing using a bait of tarpon meat. This medium-size species does not enjoy a great commercial value and is only used for local consumption. This species is the only member in …
Permanent link to this article: https://fishconsult.org/?p=10428
Feb 25 2014
Credit: Leon Felipe Alviz (Bolivia) In this fishery community, women and children receive the fish catch from fishermen who belong to the community for preparation. In this particular photo, children of different ages are handling several specimens of Pacu, Colossoma macropomun. In such remote areas whereas the city electricity is lacking fish are usually consumed …
Permanent link to this article: https://fishconsult.org/?p=10425
Feb 23 2014
Abalones are dioecious (separate male and female sex) as abalones develop their eggs and sperm in gonads located under the soft skin visible between the foot and the shell. There is no sexual dimorphism of the shell structure and so the sexing of abalone cannot be done based on the external differentiation and is only …
Permanent link to this article: https://fishconsult.org/?p=10413
