We conducted a hatchery growth study to describe the variability in growth rates, spawning, and mortality of Aplysia californica in regard to rearing temperature. Animals were housed at a standard hatchery density of five animals per cage, at temperatures of 13, 15, 18, and 21°C. Animals reared at 13 or 15°C grew as much as four times as large, lived twice as long, matured later, and spawned longer than did animals reared at 18 or 21°C. At age 170 to 205 days the fastest growth rates occurred at 18 and 21°C and the slowest at 13°C. As animals at 18 and 21°C reached sexual maturity at ages 190 to 197 days, or -60% through their lifespans, their growth rates slowed such that by age 260 days, the fastest growth rate was at 13°C, and the slowest was at 21°C. Animals reared at 13 and 15°C reached sexual maturity at 242 and 208 days, respectively, or at -40% of their life spans. Lifespan and maximum average animal weight were significantly inversely correlated with temperature (P < 0.0001). However, there were no significant differences at any temperature in the age at which maximum animal weight was reached when this age was expressed as a percentage of the life span: animals reached their maximum weight at -80% of their life span. Aging rate was highest for animals reared at 21°C, while the mortality rate doubling time was lowest at this temperature. This would be expected for the accelerated lifecycle observed at higher temperatures.
|Original language||English (US)|
|Number of pages||5|
|Journal||Contemporary Topics in Laboratory Animal Science|
|State||Published - May 1 2005|
ASJC Scopus subject areas
- Animal Science and Zoology