We hypothesize that the pattern of circuli spacing and annulus formation are responses to photoperiod and food availability which the fish experience during their existence at sea. annual breeding cycle with a long interval in which the gonads returned almost to their virgin. Thus, annuli are formed about the time of the equinox and during a declining temperature regime. However, oceanic temperatures were declining at this time and do not reach minima until April. Annuli were formed between November and January.
No significant variation in average spacing between circuli was explained by oceanic temperatures. As a verb circle is to travel around along a curved path. Article Google Scholar Li K, Yao JL, Chen YF (2006) Age and growth of an endemic cyprinid fish, Spinibarbus yunnanensis, from Lake Fuxian, China. There were significant (p < 0.05) differences in the distance between circuli formed in the summer and in the two stocks for various years at sea. As nouns the difference between circle and annulus is that circle is (lb) a two-dimensional geometric figure, a line, consisting of the set of all those points in a plane that are equally distant from another point while annulus is a ring- or donut-shaped area or structure. Barber WE, Walker RJ (1988) Circuli spacing and annulus formation: is there more than meets the eye The case for sockeye salmon, Oncorhynchus nerka. Statistical analyses were conducted only on age 2.2 fish because of small sample sizes in four of the six years for age 2.3 fish. If each annulus represented a year and the circuli appeared at regular intervals of time, then the number of circuli could vary but little. Table 5 Circulus spacing ( CSP, mm at 88 ) vs. This pattern was persistent for fishes of two river systems, six year–classes and two age groups (2.2 and 2.3) and was due to summer growth. Table 4 Rate of circulus formation ( RCF, circuli / d ) vs. spaced circuli between the annulus and the margin. The average distance between circuli formed during the second year of ocean growth is much less than that of first year or in subsequent years. River, and Nanaimo River to assess time of scale annulus formation. This study describes a pattern of circulus spacing on the scales of sockeye salmon, Oncorhynchus nerka, which has not been reported previously. Use of circuli spacing on scales to discriminate hatchery and wild barramundi, Lates calcarifer (Bloch) Aquaculture Research, 1991. Circuli spacing and annulus formation: is there more than meets the eye? The case for sockeye salmon, Oncorhynchus nerka Circuli spacing and annulus formation: is there more than meets the eye? The case for sockeye. Circuli spacing and annulus formation: Is there more than meets the eye The case for sockeye salmon, O n c o rhynchus nerka.
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