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Milkfish fry collection and handling

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Download URL
www.fao.org
Date
1990
Author
Villaluz, A.C.
Page views
3,692
ASFA keyword
food fish ASFA
milkfish culture ASFA
fry ASFA
seed collection ASFA
fish handling ASFA
storage conditions ASFA
fishing gear ASFA
AGROVOC keyword
Philippines AGROVOC
milkfish AGROVOC
Chanos chanos AGROVOC
Taxonomic term
Chanos chanos GBIF
Metadata
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Abstract
Milkfish fry can be collected in almost all the coastal waters of the tropical Indo-Pacific region. The fry season occurs at different times of the year in various sections of the species' geographical range. The season is longer near the equator and become progressively shorter at higher latitudes. In regions affected by monsoon or trade winds, the peak fry season typically coincides with one or both of the biannual wind shifts. These seasonal peaks are more or less predictable, but fry abundance may vary from year to year.

This paper summarizes the methods and practices of collection, storage, transport and acclimation of milkfish fry in various countries.
URI
http://hdl.handle.net/10862/340
Type
Conference paper
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  • Conference Proceedings [300]

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    Milkfish bibliography: a compilation of abstracts on milkfish studies 

    WorldFish Center (WorldFish Center, 2007)
    Milkfish Bibliography covers 700 references on milkfish biology; broodstock management and fry, fingerling and egg collection and production; milkfish culture systems; health and nutrition; post harvest technology; socioeconomic and related studies; and environment and ecology. Included references range from published/unpublished documents, theses, journal articles, to project reports and conference papers.
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    Ongoing research studies on maturation and spawning of milkfish, Chanos chanos at the brackishwater shrimp and milkfish culture applied research and training project, Jepara, Indonesia 

    Alikunhi, K. H. (Aquaculture Department, Southeast Asian Fisheries Development Center, 1976)
    The paper gives an account of the research work carried out at Jepara, Indonesia, on induction of maturity of milkfish in ponds and enclosures, and procurement of the spawners from the wild for seed production by hypophysation. Seven to eight years old pond grown milkfish were found sexually immature. Experiments are being conducted for growing and inducing maturity in 1-2 years old milkfish in fertilized ponds with regular tidal flow of water and also under regular hypophysation program. Milkfish spawners collected from sea had a few males in oozing condition and females mostly spent.
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    Sensitivity of fertilized milkfish (Chanos chanos Forsskal) eggs to mechanical shock and simulated transport 

    Hilomen-Garcia, Grace V. (Elsevier, 1998)
    Naturally-spawned milkfish eggs are routinely subjected to physical manipulation during collection and transport. To avoid unnecessary mortalities, sensitivity of milkfish eggs to mechanical shock was determined at different times after fertilization. Shock sensitivity was assessed in terms of egg mortality within 8 h after a free fall over calibrated heights. The LD50 and LD10 (drop height resulting in 50% and 10% mortality) were estimated for 11 stages of embryonic development. The corresponding force (F) imparted to eggs on impact after a free fall was also computed. LD10 estimates (cm) and their corresponding F (erg per egg) showed that shock sensitivity of milkfish eggs was high during cleavage until the early segmentation stage, rapidly declined as segmentation proceeded until the head and tail started to separate from the yolk, but returned to high levels when the embryo begun twitching and the heart beating until near-hatching. To determine the sublethal effects of mechanical shock, C-shaped embryos were subjected to a free fall over varying heights and transported to a hatchery for further incubation and hatching. The effects of varying periods of simulated transport (mobile or stationary periods) were also examined. At C-shaped embryo stage, neither mechanical shock (F, 13–127 erg per egg) nor prolonged shaking (3–9 h) simulating mobile periods of egg transport affected hatching rate, larval mortality, and incidence of deformed larvae. Exposure to still water (unshaken) simulating stationary periods of egg transport, however, tended to lower hatching rate and significantly increased the incidence of deformed larvae and the combined mortalities and deformed larvae. These results indicate that the sensitivity of milkfish eggs to mechanical shock varies during incubation and that C-shaped embryos may be manipulated or transported with minimum risk of injury. Some recommendations are given regarding proper handling and transport of fertilized eggs.

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