All about Fish Vetting – Dr Richmond Loh
Aquaculture plays a “critical role for aquaculture in feeding the world, stimulating economic development, providing employment and reducing existing negative impacts on the marine environment.”
Talks about co-location with other off-shore ventures, new net-pen technology and more…
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Yours sincerely,
Dr Richmond Loh
BSc BVMS MPhil MANZCVS (Aq & Pathol)
The Fish Vet, Perth, Western Australia.
Veterinary Medicine for fish.
http://www.thefishvet.com.au
Ph: +61 (0)421 822 383
A mix of foods seems the best. See latest research article below.
| Aquaculture Research | |||||||||||||||||
| Volume 43, Number 12 (November 2012) | |||||||||||||||||
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Feeding selectivity of the seahorse, Hippocampus kuda(Bleeker), juveniles under laboratory conditions | ||||||||||||||||
| Authors: | Fritzie T Celino, Grace V Hilomen-Garcia, Annabelle G C del Norte-Campos | ||||||||||||||||
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| Source: | Aquaculture Research, Volume 43, Number 12 (November 2012) | ||||||||||||||||
| Page Numbers: | 1804 – 1815 | ||||||||||||||||
| Available Full Text: |
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| Abstract: | This study examined the feeding selectivity of Hippocampus kuda juveniles under captive conditions and evaluates different food organisms that could be used to improve hatchery-rearing of this species. Newly born H. kuda were reared for 10 days in 60-L capacity tanks and fed rotifers (Brachionus rotundiformis), zooplankton (mostly Pseudodiaptomus annandalei and Acartia tsuensis) alone or both food sources. The size and amount of food ingested increased as seahorses grew. Selective feeding of seahorses appeared to change as they develop, preferring copepod adults over nauplii and rotifers. A. tsuensis was highly selected by juveniles over P. annandalei. Specific growth rate in terms of body weight (SGR-BW, 15% day–1) was the highest and mortality rate (9% at day 10) the lowest in seahorses fed a mixed food sources. Slowest growth rate (0.3% day–1) and highest mortality rate (60% at day 7) were observed in seahorses fed rotifers alone. These results indicate that copepods are suitable food for seahorse juveniles, but a mixture of food organisms in the rearing tank environment enhances survivorship and growth of H. kuda, thus potentially providing a source of cultured rather than wild specimens for characterizing the life history of this threatened species. | ||||||||||||||||
| Citation: | Fritzie T Celino, Grace V Hilomen-Garcia, Annabelle G C del Norte-Campos . Feeding selectivity of the seahorse, Hippocampus kuda(Bleeker), juveniles under laboratory conditions. Aquaculture Research, Volume 43, Number 12 (November 2012), pp. 1804-1815, <http://ejournals.ebsco.com/direct.asp?ArticleID=463A8F2B4B9DA9B5A9E9> | ||||||||||||||||
| URL: | http://ejournals.ebsco.com/direct.asp?ArticleID=463A8F2B4B9DA9B5A9E9 | ||||||||||||||||
Did you know that along with my YouTube channel (thefishvetdrloh), I have included the most useful ones on my website under the pictures/videos section?
Follow this link to bring you straight there –
It took me two weeks of giving this work experience student the guilt trip before he finally LIKED my Facebook Fanpage!
SUCCESS !!!!
So, if you haven’t already done so, please do like what I’ve coined, my Facebook Fin-page!
This abstract details the use of another anaesthetic drug in fish.
Objective—To determine anesthetic effects of ketamine and medetomidine in bonitos and mackerels and whether anesthesia could be reversed with atipamezole.
Design—Clinical trial.
Animals—43 bonitos (Sarda chiliensis) and 47 Pacific mackerels (Scomber japonica).
Procedure—28 bonitos were given doses of ketamine ranging from 1 to 8 mg/kg (0.5 to 3.6 mg/lb), IM, and doses of medetomidine ranging from 0.2 to 1.6 mg/kg (0.1 to 0.7 mg/lb), IM (ratio of ketamine to medetomidine, 2.5:1 to 20:1). Doses of atipamezole equal to 1 or 5 times the dose of medetomidine were used. The remaining 15 bonitos were used to determine the anesthetic effects of ketamine at a dose of 4 mg/kg (1.8 mg/lb) and medetomidine at a dose of 0.4 mg/kg (0.2 mg/lb). The mackerels were given ketamine at doses ranging from 11 to 533 mg/kg (5 to 242 mg/lb) and medetomidine at doses ranging from 0.3 to 9.1 mg/kg (0.1 to 4.1 mg/lb; ratio of ketamine to medetomidine, 3:1 to 800:1). Doses of atipamezole equal to 5 times the dose of medetomidine were used.
Results—IM administration of ketamine at a dose of 4 mg/kg and medetomidine at a dose of 0.4 mg/kg in bonitos and ketamine at a dose of 53 to 228 mg/kg (24 to 104 mg/lb) and medetomidine at a dose of 0.6 to 4.2 mg/kg (0.3 to 1.9 mg/lb) in mackerels was safe and effective. For both species, administration of atipamezole at a dose 5 times the dose of medetomidine reversed the anesthetic effects.
Conclusions and Clinical Relevance—Results suggest that a combination of ketamine and medetomidine can safely be used for anesthesia of bonitos and mackerels and that anesthetic effects can be reversed with atipamezole. ( J Am Vet Med Assoc 2004;225:417–421)
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Dr Richmond Loh
Did you know that barramundi start as males and then as they get bigger, turn into females (the feminists may say,”Mature into females!”)?
The reverse is true in wrasses. The fish that live in small groups start off as females and the largest, most mature fish becomes the male. This male guards their territory and his harem. If the male meets his demise, then the next largest fish (a female) will turn into the new male fish!
Of the popular aquarium fishes, some say that some of the female swordtail fish can turn into males, developing the long caudal fin extension and modification of the anal fin to form the gonopodium.
These are just a few examples of the sex changing fishes out there.
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Dr Richmond Loh
This recent research shows it takes on average, up to 8 years for farmers to get a return on investment. So, it really does pay to get it right, right from the start… as this paper reports.
| Aquacultural Engineering | |||||||||||||||||
| Volume 51, Number 11 (November 2012) | |||||||||||||||||
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Recirculating Aquaculture Systems (RAS) analysis: Main issues on management and future challenges | ||||||||||||||||
| Authors: | Maddi Badiola 1, Diego Mendiola 1, John Bostock 2 | ||||||||||||||||
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| Source: | Aquacultural Engineering, Volume 51, Number 11 (November 2012) | ||||||||||||||||
| Page Numbers: | 26 – 35 | ||||||||||||||||
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| Abstract: | ? RAS companies, researchers and consultants all over the world were surveyed. ? Poor system designs, water quality issues and mechanical problems are the main constraints. ? 50% of the surveyed companies have been rebuilt or redesigned due to RAS system’s failure. ? More than 8 years are needed to get back initial investment. ? In the future, information platforms, their availability and specialized education will be required. | ||||||||||||||||
| Citation: | Maddi Badiola, Diego Mendiola, John Bostock . Recirculating Aquaculture Systems (RAS) analysis: Main issues on management and future challenges. Aquacultural Engineering, Volume 51, Number 11 (November 2012), pp. 26-35, <http://ejournals.ebsco.com/direct.asp?ArticleID=49E28942163732A24E42> | ||||||||||||||||
| URL: | http://ejournals.ebsco.com/direct.asp?ArticleID=49E28942163732A24E42 | ||||||||||||||||
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Follow me on: Facebook “Fin Page” – YouTube – Blog – Linkedin – Twitter
Dr Richmond Loh
The topic of what’s the best antibiotics has been rather popular on my blog and also a topic of great interest at my recent presentation to the Koi Society of WA on treating fish with ulcers. So, I think this might be a good time to resurrect one of my old YouTube clips that’s pertinent to the topic.
Sentinel species are used to inform us about environmental processes that are too difficult or too expensive to measure directly. In conservation biology, an ideal sentinel species is a large-bodied, wide-ranging creature occupying top positions in local food webs.
Historically sentinel species were used on a presence-absence basis, much like a canary in a coal mine. Unfortunately, by the time such a sentinel vanished to indicate that a habitat was deteriorating, it was too late to save what remained.
In the aquatic realm, a different choice of species would be more appropriate so that we can detect when habitats are becoming degraded long before the top predator species disappears; when there is still plenty of time to work with local wildlife managers to save these habitats.
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Follow me on: Facebook “Fin Page” – YouTube – Blog – Linkedin – Twitter
Dr Richmond Loh
If you’re in the area and require a fish vet to attend to your sick fish, give Dr Loh a call.