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Egg cannibalism by milkfish (Chanos chanos Forsskal) spawners in circular floating net cages

Identifieur interne : 00B295 ( Main/Exploration ); précédent : 00B294; suivant : 00B296

Egg cannibalism by milkfish (Chanos chanos Forsskal) spawners in circular floating net cages

Auteurs : J. D. Toledo [Philippines] ; A. G. Gaitan [Philippines]

Source :

Journal of Applied Ichthyology [ 0175-8659 ] ; 1992-08.

RBID : ISTEX:499860CD6CC13F88B244EFBCA5A5E24FC1BB91F7

Descripteurs français

Wicri :
- topic : Aquiculture.

English descriptors

KwdEn :
- Adult milkfish, Aquaculture, Aquaculture department, Asian aquacult, Asian fisheries development center, Bagarinao, Broodstock, Cannibalism, Chanos, Chanos chanos forsskal, Digestive tract, Digestive tracts, Eier, Filter feed, First asian fisheries forum, Fishery, Forsskal, Hapa, Iloilo, Initial detection, Lacanilao, Marte, Milkfish, Milkfish chanos chanos, Milkfish eggs, Milkfish spawners, Present study, Spawner, Sweeper, Toledo, Total number, Water column, Water samples.
Teeft :
- Adult milkfish, Aquaculture, Aquaculture department, Asian aquacult, Asian fisheries development center, Bagarinao, Broodstock, Cannibalism, Chanos, Chanos chanos forsskal, Digestive tract, Digestive tracts, Eier, Filter feed, First asian fisheries forum, Fishery, Forsskal, Hapa, Iloilo, Initial detection, Lacanilao, Marte, Milkfish, Milkfish chanos chanos, Milkfish eggs, Milkfish spawners, Present study, Spawner, Sweeper, Toledo, Total number, Water column, Water samples.

Abstract

Egg cannibalism by milkfish spawners in a circular floating net cage was investiated. The cage was lined with a fine mesh hapa net to retain spawned eggs and to prevent the entry of kh eg predators. Water samples were collected from the surface (0 m), middle (1.5 m), and bottom (3.0 m) of a 10 m diameter by 3 m deep floating net cage at the time of initial detection of spawning (0 min) and at 30, 60, 120 and 240 min thereafter. The mean number of spawned eggs at the surface significantly decreased (P<0.05) 60 min after spawning and very few eggs were recovered 240 min later. There was no significant difference (P>0.05) in the mean number of spawned eggs collected from the middle and bottom of the net cage at various times after spawning. Eggs were found in the digestive tract of all milkfish sampled (n=6) at about 5 h after spawning, indicating that carive milkfish eat their own eggs. It is recommended that spontaneously spawned milkfish eggs shoud be collected immediately after spawning to avoid loss by egg cannibalism.

Url:

https://api.istex.fr/document/499860CD6CC13F88B244EFBCA5A5E24FC1BB91F7/fulltext/pdf

DOI: 10.1111/j.1439-0426.1992.tb00692.x

Affiliations:

Philippines

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Le document en format XML

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<term>Asian fisheries development center</term>
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<term>Cannibalism</term>
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<front><div type="abstract" xml:lang="en">Egg cannibalism by milkfish spawners in a circular floating net cage was investiated. The cage was lined with a fine mesh hapa net to retain spawned eggs and to prevent the entry of kh eg predators. Water samples were collected from the surface (0 m), middle (1.5 m), and bottom (3.0 m) of a 10 m diameter by 3 m deep floating net cage at the time of initial detection of spawning (0 min) and at 30, 60, 120 and 240 min thereafter. The mean number of spawned eggs at the surface significantly decreased (P<0.05) 60 min after spawning and very few eggs were recovered 240 min later. There was no significant difference (P>0.05) in the mean number of spawned eggs collected from the middle and bottom of the net cage at various times after spawning. Eggs were found in the digestive tract of all milkfish sampled (n=6) at about 5 h after spawning, indicating that carive milkfish eat their own eggs. It is recommended that spontaneously spawned milkfish eggs shoud be collected immediately after spawning to avoid loss by egg cannibalism.</div>
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Egg cannibalism by milkfish (Chanos chanos Forsskal) spawners in circular floating net cages

Egg cannibalism by milkfish (Chanos chanos Forsskal) spawners in circular floating net cages

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri