Biogenic acidification of Portuguese oyster Magallana angulata mariculture can be mediated through introducing brown seaweed Sargassum hemiphyllum

Small mobile crustaceans are abundant on seaweeds. Many of these crustaceans rapidly abandon their host if it is detached from the seafloor and floats towards the surface, but the trigger for this ‘bailout’ behaviour is unknown. We tested 2 potential cues, i.e. rapid change in light and rapid change in water pressure, using >1 mm epifauna on the brown seaweed Carpophyllum plumosum as a model system. Bailout occurred in response to reduced water pressure, but not to changing light, as (1) bailout occurred at similar rates in light and dark, (2) bailout occurred on the seafloor when water pressure was reduced within a transparent chamber by the equivalent of ~0.5 m depth or more, and (3) little bailout occurred when water pressure was held constant within the chamber while seaweeds were raised to the surface. Increase in pressure (simulating sinking) did not induce bailout. The rate of bailout increased with increasing magnitude of pressure reduction but was not influenced greatly by the rate of change of pressure within the range tested (up to an equivalent of 0.4 m depth s-1). The use of pressure rather than light as a cue for bailout is consistent with the need for seaweed-associated crustaceans to rapidly abandon a detached host and relocate to suitable habitat during both day and night.

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Fucoxanthin Content and Chemical Composition in Brown Seaweed, Nizamuddinia zanardinii (Phaeophyta) Collected from Mirbat, Southern Oman (The Arabian Sea)

International Journal on Algae ◽

10.1615/interjalgae.v19.i3.60 ◽

2017 ◽

Vol 19 (3) ◽

pp. 259-270

Author(s):

M. Chesalin ◽

S. Al-Ghassani ◽

V. I. Ryabushko ◽

N. I. Bobko ◽

E. Gureeva ◽

...

Keyword(s):

Chemical Composition ◽

Arabian Sea ◽

Brown Seaweed ◽

Nizamuddinia Zanardinii

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NEW GENERATION FEED ADDITIVE IN POULTRY BREEDING

Vestnik of the Russian agricultural science ◽

10.30850/vrsn/2019/1/67-69 ◽

1970 ◽

pp. 67-69

Author(s):

L. I. Naumova ◽

М. Т. Klychnikov ◽

N. F. Klychnikova

Keyword(s):

Laying Hens ◽

Far East ◽

Brown Seaweed ◽

Test Group ◽

Live Weight ◽

Production Quality ◽

Feed Additive ◽

Poultry Production ◽

Omega 3 ◽

Mineral Substances

The analysis of different doses of complex feed additive to poultry ration have been made. The influence of new feed additive with bioresources of the Far East use on productive poultry indexes, on production quality and digestibility of nutritious matters of mixed feed has been studied. Patrinia scabiosifolia, Acanthopanax sesseliflorum, cones of cedare nut husk, brown seaweed, macro- and microelements, vitamins were the object of research. As a result of these researches author presents more effective norms of complex feed additive use in poultry farming of Khabarovsk Kray. The recipe of feed additive from local vegetable resources and complex of vitamins and minerals for use in laying hens nutrition was worked out. The aim of this work was to rise zootechnic and economic indexes of poultry production. The introduction of complex feed additive in ration influenced positively on the digestibility, raised the content of Omega-3 fat acid in egg of laying hens. The increase of Omega-3 fat acid quantity promotes decrease of cholesterol in yolk of egg. In the experimental groups there was a more intensive use of nutrients in diet, mainly due to raw protein, fats, mineral substances – calcium and phosphorus. The use of a new feed additive had a positive effect on the hatchability of eggs, the development of internal organs (heart, liver) and the live weight of chicks obtained from the eggs of chickens in experimental groups. Additionally, the content of mineral substances (calcium, potassium, phosphorus) in the egg of test group was higher than in the control on average by 2.3-5.1%.

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