The Giant Pacific Octopus, Enteroctopus dofleini (Introduction and distribution)- Video

This short video was taken on 9 June, 2012 at: Monterey Bay Aquarium, California, USA

Introduction: The Giant Pacific Octopus or North Pacific Giant octopus (Enteroctopus dofleini), is claimed to be the largest or the second largest octopus in the world. This animal belongs to the genus Enteroctopus, order Octopoda. Octopuses are cephalopod mollusks characterized by having eight arms with an average length close to 5 meters. Thousands of suckers are located on the eight arms on which an octopus creeps, crawls, and glides over the ocean floor. The giant octopus has a reddish-brown body, called the mantle that contains most of the animal’s major organs. Octopuses have the most complex brain of the invertebrates and they have long term and short-term memories. Even though it is very unusual to find individuals of 45 kg of weight, there are records for a few individuals with more than 136 kg.

Distribution: The giant octopus, Enteroctopus dofleini can be found in the continental shelf of the North Pacific Ocean, where its range extends from southern California, north along the coastline of the Pacific Northwestern Americas, across the Aleutians, and south to Japan. The species usually occurs at depth of around 65 meters. However, it can be found in much shallower water as well as in much deeper water which may reach 750 m.

References: Giant Octopus: Fact Sheet; Aquaria poster; Marinebio; Wikipedia

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Cage farming of Nile tilapia, Oreochromis niloticus in Lake Dogodogo, Burundi

Credit: Alain Manirambona (Burundi)

The first floating cage in Burundi was installed in April 2012 in the lake Dogodogo, Cibitoke province. This cage is 6×6 m, and has 4 compartments. The juveniles of Nile tilapia, Oreochromis niloticus have been stocked  in the cage. The first picture shows the cage during assembling near the beach, the next shows the cage already fixed in the lake, the last picture show stocking of tilapia juveniles in the cage.

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=3807

Fish stocking of Susu Dam in Ghana

Credit: Grace Charway (Ghana)

This is stocking of the Susu dam which has a surface area of 1.0 ha in the Lawra district in the Upper West Region, Ghana. The fingerlings were taken from the Billibor dam by the fishermen in the community under the supervision of officials from the Fisheries Commission. As been established, about 5 % of all irrigable land is allocated to fisheries activities. The stocking of dams is usually done by the officials of the Fisheries Commission for the community to provide them with some protein in their diet.  Due to the less efficiency of the existing hatchery, fishery officials have no choice but to harvest fingerlings of various quality from the already depleted stocks in the other dams.

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=3795

Sexing tilapia fingerlings by women in Gabon (in French)

Credit: Charles Ibinga Maganga (Gabon)

Ici c’est une journée de sexage à SIAT/GABON, regarder la forme des épuisettes avec  leur  cerceau en liane; les femmes récupèrent les tilapia fingerlings (Pm≈ 40gr) dans les 30 étangs de pré-grossissements (36m²/étang); les mises en charge dans ces étangs se font à 20 alevins/m². Par jour je sexe environs 3500 fingerlings avec mon agent piscicole. Cette ferme piscicole compte 5 étangs de Reproduction (120m² chacun); 30 de Pré-grossissement (36m²/1) et 6 de Grossissement (3 de 20 ares et 3 de 30 ares).

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.

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Permanent link to this article: https://fishconsult.org/?p=3783

A typical fish market in Banito city, Unity state (South Sudan)

Credit: Juma Frezar (South Sudan)

The two photos show a typical fish market in Banito city, Unity State (South Sudan). One of the photos shows the customers who could not find their target fresh fish as what was there was dried fish of lower consumer preference. The second photo shows a fish trader who refused to lower the price of his fish as requested by women clients especially the trader was aware about the shortage of fresh fish in the market in that day.

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=3769

Feeding of tilapia fry using a long handled feeder (Egypt) – Video

This video shows the feeding of tilapia fry in a hapa fixed in an earthen pond in Egypt). The long handled feeder helps to carry out feeding from a distance and to spread the powdered feed over the surface of the nursing hapa.

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Permanent link to this article: https://fishconsult.org/?p=3763

Activities carried out on Uburimyi N’ubworozi station in Burundi – (Movie)

Credit: Alain Murekambanze (Burundi)

Source: www.fishconsult.org

This 17-min movie has been produced by Uburimyi N’Ubworozi (Burundi). The movie shows various activities carried out on the station including a brief on the reproduction of African catfish (Clarias garepinus) and brood stock maintence. The movie also shows a glance on the activities of Nile tilapia (Oreochromis niloticus) as well as the key integrated organisms with aquaculture as represented in poultry, rabbit and goats.

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Permanent link to this article: https://fishconsult.org/?p=3755

Hand sorting of African catfish, Clarias gariepinus – Video

Credit for the video: El-Sadig Hagar (Sudan)   Description: Abdel Rahman El Gamal

This video shows a hand grading process of African catfish, Clarias gariepinus.  We notice the ability of fish to move (walk) using its pectoral fins. This particular video was taken during the sorting of African catfish to be used in a predation study for catfish on tilapia fry. taken during the sorting of African catfish to be used in a predation study for catfish on tilapia fry. It may worth mentioning that the use of graders in sorting of African catfish will be much better and less stressful than hand sexing. The video shows the movement of catfish which explains why “walking catfish” is among the common names of the species.

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Permanent link to this article: https://fishconsult.org/?p=3748

Fish aging – general and scale reading

This 2-slide information bite addresses fish aging topic covering its importance and applications in fishery management as well as aquaculture. The main fish aging methods are listed including the reading of scales, opercula, otolith or vertebrae. The focus has been placed on scale reading being the simplest method in fish aging as well as the conditions that favor or do not favor the use of scale reading in fish aging.

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Permanent link to this article: https://fishconsult.org/?p=3738

Reproduction of rainbow trout (Oncorhynchus mykiss) in Kenya (Egg stripping and fertilization)

Credit: Edwin Muga (Kenya)

Striping eggs from a gravid female: The  stripping of the female is done under experienced hands of the hatchery  personnel at the Kibaru trout hatchery on the slopes of Mount Kenya, Kenya.

Egg fertilization: The second photo shows the  mixing of the sperm from a male brooder with the previously stripped eggs.

Rainbow trout, Oncorhynchus mykiss, is a cold water species that tolerates optimal tempertures of 15o Centigrade and below. Water used in the hatchery should be constantly flowing, well oxygenated  and crystal clear.

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.

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Permanent link to this article: https://fishconsult.org/?p=3720

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