Preliminary observation of growth-promoting effects of alginate hydrolysates on juvenile Manila clams,Ruditapes philippinarum

2013 ◽  
Vol 46 (4) ◽  
pp. 1013-1017 ◽  
Author(s):  
Yasuhiro Yamasaki ◽  
Shigeru Taga ◽  
Masanobu Kishioka
Keyword(s):  
Ruditapes Philippinarum ◽  
Preliminary Observation ◽  
Growth Promoting

scholarly journals A metabolic profile in Ruditapes philippinarum associated with growth-promoting effects of alginate hydrolysates

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Yasuhiro Yamasaki ◽  
Shigeru Taga ◽  
Masanobu Kishioka ◽  
Shuichi Kawano
Keyword(s):  
Energy Source ◽  
Mass Culture ◽  
Metabolic Profile ◽  
Culture Method ◽  
Ruditapes Philippinarum ◽  
Reproductive Tissue ◽  
Promoting Effect ◽  
Food Satiation ◽  
Growth Promoting ◽  
Algal Diet

Abstract The aim of this study is to demonstrate the growth-promoting effect of alginate hydrolysates (AHs) on the Manila clam Ruditapes philippinarum, and to verify the physiological change occurring within a living R. philippinarum stimulated by AHs. We show that growth of clams was dramatically promoted by supplementing a diet of the diatom Chaetoceros neogracile with AHs at 4 mg/L. Furthermore, metabolomics indicates that each state of starvation, food satiation, and sexual maturation have a characteristic pattern. In the groups given AHs in addition to C. neogracile in particular, excess carbohydrate was actively utilized for the development of reproductive tissue. In contrast, it appeared that clams in the groups given C. neogracile only were actively growing, utilizing their adequate carbohydrate resources. Meanwhile, the unfed groups have slowed growth because of the lack of an energy source. Hence, supplementation of AHs in addition to the algal diet may be an inexpensive way to shorten the rearing period of R. philippinarum. Moreover, metabolomics can evaluate the growth condition of R. philippinarum in a comprehensive way, and this approach is crucially important for not only the development of a mass culture method but also for the conservation of the clam resource in the field.

Fine structure of the retina of the giant scallop, Placopecten magellanicus

1984 ◽  
Vol 42 ◽  
pp. 312-313
Author(s):  
C.V.L. Powell
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Light Intensity ◽  
Scanning Electron Microscope ◽  
Eye Development ◽  
Preliminary Observation ◽  
Columnar Epithelium ◽  
Placopecten Magellanicus ◽  
Environmental Light ◽  
Scanning Electron

The overall fine structure of the eye in Placopecten is similar to that of other scallops. The optic tentacle consists of an outer columnar epithelium which is modified into a pigmented iris and a cornea (Fig. 1). This capsule encloses the cellular lens, retina, reflecting argentea and the pigmented tapetum. The retina is divided into two parts (Fig. 2). The distal retina functions in the detection of movement and the proximal retina monitors environmental light intensity. The purpose of the present study is to describe the ultrastructure of the retina as a preliminary observation on eye development. This is also the first known presentation of scanning electron microscope studies of the eye of the scallop.

Xyloglucan- and cello-oligosaccharides: Antagonists of the growth-promoting effect of H+

1990 ◽  
Vol 80 (1) ◽  
pp. 109-113 ◽  
Author(s):  
Ester P. Lorences ◽  
Gordon J. McDougall ◽  
Stephen C. Fry
Keyword(s):  
Promoting Effect ◽  
Growth Promoting

Virtual Therapy in Patients with Depression: Preliminary Observation

2006 ◽  
Author(s):  
Vasile Chirita ◽  
Mircea llinca ◽  
Roxana Chirita ◽  
Marinela Bisca ◽  
Gabriela Chele
Keyword(s):  
Preliminary Observation ◽  
Virtual Therapy

Growth-promoting supervision: Reflections from women of color psychology trainees.

2019 ◽  
Vol 13 (3) ◽  
pp. 167-173
Author(s):  
Fiona C. Thomas ◽  
Jhodi-Ann Bowie ◽  
Lincoln Hill ◽  
Joelle T. Taknint
Keyword(s):  
Women Of Color ◽  
Psychology Trainees ◽  
Growth Promoting ◽  
Color Psychology

Production of asari (Manila) clams, Ruditapes philippinarum, during the period of harvest decrease in the 2000s in the Banzu tidal area, Tokyo Bay

2020 ◽  
Vol 33 ◽  
pp. 14
Author(s):  
Mitsuharu Toba ◽  
Jun Kakino ◽  
Kazuo Tada ◽  
Yutaka Kobayashi ◽  
Hideharu Tsuchie
Keyword(s):  
Field Investigation ◽  
Ruditapes Philippinarum ◽  
Management Style ◽  
Seed Stock ◽  
Tokyo Bay ◽  
Yearly Variation ◽  
Culture Area ◽  
Stock Biomass ◽  
Tidal Area ◽  
High Level

In Tokyo Bay, the harvestable quantity of asari (Manila) clams Ruditapes philippinarum has been decreasing since the late 1990s. We conducted a field investigation on clam density in the Banzu culture area from April 1988 to December 2014 and collected records spanning January 1986 to September 2017 from relevant fisheries cooperative associations to clarify the relationship between the temporal variation in stock abundance and the production activities of fishermen. The yearly variation in clam abundance over the study period was marked by larger decreases in the numbers of larger clams. A large quantity of juvenile clams, beyond the biological productivity of the culture area, may have been introduced as seed stock in the late 1980s despite the high level of harvestable stock. The declines in harvested quantity began in the late 1990s and may have been caused by decreases in harvestable stock despite the continuous addition of seed stock clams. The harvested quantity is likely to be significantly dependent upon the wild clam population, even within the culture area, as the harvestable quantity was not correlated with the quantity of seed stock introduced during the study period. These declines in harvested quantity may have resulted from a decreasing number of operating harvesters due to the low level of harvestable stock and consequently reduced profitability. Two findings were emphasized. A certain management style, based on predictions of the contributions of wild and introduced clams to future stock biomass, is essential for economically-feasible culturing. In areas with less harvestable stock, actions should be taken to maintain the incomes of harvesters while avoiding overexploitation, even if the total harvest quantity decreases.

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