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Re: N. orthonotus - incubation trivia
Brian- very interesting
A few questions just out of interest
1. How many times had you wet the peat in those 3 years- was this bag
treated typically or lost and then refound?
2. Did you regularly dampen/open the bag during those 3 years, or did the
peat just sit there- how warm?
3. You say you got such an excellent hatch this time- did you get a better
one earlier- was there any evidence of embryos that had gone too far and
died? Did you do anything special to stop this?
4.Whats the record incubation for typical nothos ( as in ones that normally
take 3 months).
When rewetting eggs I don't usually get more than a few percent of the
number that I got first time round. Is it due to my egg storage conditions,
or more to do with the species I have been hatchin?
TIA
jules
-----Original Message-----
From: Brian R. Watters <bwatters at sk_sympatico.ca>
To: AKA KillieTalk <killietalk at aka_org>
Date: 24 October 1999 23:07
Subject: N. orthonotus - incubation trivia
>I thought that some subscribers interested in annual killifish might find
>the following information interesting:
>
>I wet some peat of various species of Nothos this weekend, among them N.
>orthonotus MW 91/8 (one of three populations of this species that Harry
>Woodsford and I collected in southern Malawi in 1991). I always inspect the
>peat carefully for eggs before I wet it and in doing so I found a good
>number of both eyed and clear eggs in the oldest spawning of this
population
>that I had in my incubator. The spawning was 3 years, 5 months and 2 weeks
>old ! The next oldest, at 3 years 4 months had even more eggs, both clear
>(undeveloped) and eyed. I got an excellent hatch from these with perfectly
>healthy fry.
>
>I regularly hatch various populations of N. orthonotus, N. furzeri, N.
>rachovii, N. sp. Hoba, N. sp. Liwonde, etc. after incubation periods of 1-2
>years but the MW 91/8 case beats my own previous record which was for N.
>rachovii KNP Black. About a year ago I hatched a large batch of fry of this
>species from a spawning that was 3 years, 3 months and 2 weeks old - and
>there were clear, undeveloped eggs in that one too.
>
>If you consider the specific climatic conditions under which some Notho
>species have to survive (frequent periods of drought lasting for 2 years or
>more) it is really not surprising that the eggs can survive for so long.
>__________________________________________
>Brian R. Watters
>University of Regina
>Regina, Saskatchewan S4S 0A2, Canada
>Ph: (306) 584-9161 (home); (306) 585-4663 (work)
>Fax: (306) 585-5433
>E-mail: bwatters at sk_sympatico.ca
>
>
>
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