The Fish Vet's Blog

Aquaculture Volume 321, Number 3-4 (December 2011)

Efficacy of marine yeasts and baker’s yeast as immunostimulants in Fenneropenaeus indicus: A comparative study

Authors: P.J. Sarlin, Rosamma Philip Author Affiliations:

Source: Aquaculture, Volume 321, Number 3-4 (December 2011) Page Numbers: 173 – 178 Available Full Text:

Abstract: Efficacy of marine yeasts Debaryomyces hansenii(S8) and Candida tropicalis(S186) as immunostimulants to Indian white prawn Fenneropenaeusindicuswas estimated in comparison with Saccharomyces cerevisiaeS36. Biomass of yeast strains was prepared using Malt Extract Agar and incorporated into a standard diet to prepare yeast diets of varying concentrations. F. indicuswere fed these diets for a period of 14days and then challenged orally with white spot syndrome virus (WSSV) and immune assays like total hemocyte count, phenol oxidase, NBT reduction, alkaline phosphatase and acid phosphatase were performed. Generally yeast diets provided better protection to F. indicusagainst WSSV compared to control. Marine yeast diet was found to support maximum immunostimulation evidenced by enhanced shrimp immunity. The study showed that marine yeasts D. hansenii(S8) and C. tropicalis(S186) are effective immunostimulants in F. indicusand they perform better than the baker’s yeast, S. cerevisiae.

Citation: P.J. Sarlin, Rosamma Philip . Efficacy of marine yeasts and baker’s yeast as immunostimulants in Fenneropenaeus indicus: A comparative study. Aquaculture, Volume 321, Numbers 3-4 (December 2011), pp. 173-178,

Aquaculture Volume 321, Number 3-4 (December 2011)

Replacement of fish meal with a matrix of organic plant proteins in organic trout (Oncorhynchus mykiss) feed, and the effects on nutrient utilization and fish performance

Authors: Ivar Lund, Johanne Dalsgaard, Hanne Tolderlund Rasmussen, Jørgen Holm, Alfred Jokumsen Author Affiliations:

Source: Aquaculture, Volume 321, Number 3-4 (December 2011) Page Numbers: 259 – 266 Available Full Text:

Abstract: This study examined the effects on nutrient utilization and fish performance when replacing 16, 31, and 47% of fish meal protein (corresponding to replacing 15, 29 and 44%, respectively, of total dietary protein) with a fixed matrix of organic pea, horsebean and rapeseed plant protein concentrates (PPC) in a ratio of 1.07:1.00:0.66. Four iso-energetic and iso-nitrogenous diets were produced to include 0, 136, 274 or 410gkg-1of the organic PPC matrix, respectively. The organic protein ingredients were chosen based on their high protein content, and the matrix was established to mirror the amino acid composition of fish meal. The plant ingredients were dried, dehulled, grinded and air classified in accordance with the European Union Commission Regulation on organic aquaculture production, increasing the protein concentrations up to 577gkg-1dry matter. Two experiments were carried out using juvenile rainbow trout (Oncorhynchus mykiss): 1) a digestibility study to examine the apparent digestibility of protein, lipid, nitrogen-free extract (NFE), total phosphorus and phytate-phosphorus, followed by a water sampling period to determine the output of nitrogen and phosphorus and enabling the setup of nitrogen and phosphorus mass-balances; and 2) a 57day growth study including 3 growth periods each of 19days and using pit-tagged fish. Substituting fish meal with organic PPC significantly increased the apparent digestibility coefficient (ADC) of protein and lipid (P<0.008) at the highest PPC inclusion level, while there was a significant (P<0.044) decrease in the ADC of NFE with increasing PPC inclusion level. The apparent digestibility coefficient of phytate-phosphorus was significantly lower (P<0.005) at the highest PPC inclusion level compared to the fish meal control diet. The mass-balances revealed a significant increase in the excretion of ammonium-nitrogen (NH4N, P<0.017) at the two highest PPC inclusion levels and a decrease in phosphorus (P<0.009) excretion at the highest organic PPC inclusion level. There was no overall effect on the specific growth rates (SGRs) or feed conversion ratios (FCRs). The study thus demonstrated that it is possible to replace fish meal by 47% organic PPC without compromising rainbow trout performance. However, the results also indicated that it will be difficult to replace much more than this as long as supplementation with synthetic amino acids and exogenous phytase is not allowed in organic feed.

Citation: Ivar Lund, Johanne Dalsgaard, Hanne Tolderlund Rasmussen, Jørgen Holm, Alfred Jokumsen . Replacement of fish meal with a matrix of organic plant proteins in organic trout (Oncorhynchus mykiss) feed, and the effects on nutrient utilization and fish performance. Aquaculture, Volume 321, Numbers 3-4 (December 2011), pp. 259-266,

Please watch this program.
http://www.abc.net.au/iview/#/view/851259

If you ever see pond reared goldfish, you will notice that their colours are more vibrant and intense than their indoor counterparts. Could it be the effect of the sun? Could it be to do with supplementary feeds they get such as insects and algae? Probably a combination.

What I just learnt today though, is that hammerhead sharks can and do get skin tans!

Probably a bull shark. Beware!

From today’s West Australian.

Begin forwarded message:

From: noreply>
Date: 8 November 2011 6:20:06 AWST
To: Undisclosed Recipients
Subject: Disease News Update

AquaticHealth.net Disease News Update >> Catfish tumor – USA [ProMed request for information]

Link to source content: http://www.hometownannapolis.com/news/TOP/2011/10/31-31/Cause-of-catfish-tumors-still-unknown.html.

Your input is important: Please verify and add any relevant commentary to this report. Also, is the information in the report summarised somewhere in the Wiki?

Report Content:

CATFISH TUMOR – USA: (MARYLAND) REQUEST FOR INFORMATION

*******************************************************

A ProMED-mail post

ProMED-mail is a program of the

International Society for Infectious Diseases

Date: Mon 31 Oct 2011

Source: Howntownannapolis.com, The Capital Gazette [edited]

Cause of catfish tumors still unknown

Aquaculture International: Journal of the European Aquaculture Society Volume 19, Number 6 (December 2011)

Ovaprim treatment promotes oocyte development and milt fertilization rate in diploid and triploid African catfish (Clarias gariepinus)

Authors: Ali Karami ¹, Annie Christianus ¹, Hadi Zokaeifar ¹, Khairul Saad ¹, Fahmi Imraan ¹, Shahram Shakibazadeh ¹, Hossien Negarestan ², Simon Courtenay ³ Author Affiliations:

Source: Aquaculture International: Journal of the European Aquaculture Society, Volume 19, Number 6 (December 2011) Page Numbers: 1025 – 1034 Available Full Text:

Abstract:

Citation: Ali Karami, Annie Christianus, Hadi Zokaeifar, Khairul Saad, Fahmi Imraan, Shahram Shakibazadeh, Hossien Negarestan, Simon Courtenay . Ovaprim treatment promotes oocyte development and milt fertilization rate in diploid and triploid African catfish (Clarias gariepinus). Aquaculture International: Journal of the European Aquaculture Society, Volume 19, Number 6 (December 2011), pp. 1025-1034,

Keeping it simple….

EpiDiseaseOutbreakInvest WorkshopMar12.pdf