By Rex A. Dunham
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Extra info for Aquaculture and fisheries biotechnology. Genetic approaches
2001). , 1997) had similar survival to that of diploids in ponds. , 1997).
The canthaxanthin concentration in the muscle and ovary combined for the diploids was not different from the total in the muscle of the triploids, as apparently the triploids diverted deposition to the ﬂesh as the ovaries are underdeveloped in the triploids. Four weeks after spawning the canthaxanthin level reached the same level in the muscle of both diploids and triploids. , 1997). Survival The relative survival of triploids is variable. Salmon female ϫ brown trout males had the same survival as Atlantic salmon in saltwater net pens (Galbreath and Thorgaard, 1997).
1999a,b,c). Temperature and salinity can affect the rate of induction of polyploidy in shellﬁsh and invertebrates, speciﬁcally the geoduck clam, Panope abrupta (Vadopalas and Davis, 1998). The timing of the meiotic divisions and extrusion of the ﬁrst and second polar bodies are different for ﬁsh and shellﬁsh. , 1989). Fertilized eggs are 2N, 3N or 4N if the treatment affects polar body I, 3N if the treatment affects polar body II and 5N if the treatment affects both polar bodies I and II. However, Stephens and Downing (1988) produced at least some of the three ploidy levels, 2N, 3N and 4N, when attempting to block either polar body I or II.