Hatching success affects the timing of spawning by the intertidally spawning puffer Takifugu niphobles

Abstract

ABSTRACT-The puffer T a k~f u g u niphobles, which is an Intertidal spawner and deposits eggs in the upper intert~dal zone, spaivns on sevrral days of every spring tide d u n n g spring to summer (i.e the semilunar spdwnlng cycle). As the season progresses, however, the tlming of spawnlng cvents progressively s h~f t s from just before to just after the new or full moon. This study explains why there is the seasonal shift In the timing of spawning from the viewpoint of larval hatching success. Larval sampling in the field and rearlng experiments in the laboratory indicated that hatching occurred only when the nighttime h~g h t~d e s flood the stranded eggs. Accord~ng to ambient temperatures, incubation penods tended to b e shorter as the season progressed. Therefore. spawning occurs prior to the peak s p n n g t~d e s (dates of new and full moons) early In the season to allow sufficient t~m e for completion of embryological devclopment prior to the occurrence of neap tides, which may not flood the intertidal spawnlng site. The relationship between the zone of stranded eggs and the tidal reglme at the site indicated that most of the completely developed embryos can be successfully submerged by nighttime high tides for the greater part of the season Quadrat sampling of eggs showed that many embryos died because of temperature stress during Intertidal incubat~on. The most advantageous time for embryo surv~val IS, especially later in the season, after the peak spring tides when the intertidal zone is inundated a t midday and temperatures are moderated by the water cover T h e progressive shift in the timing of spawning is the result of a seasonal trade-off between the embryo survival during intertidal incubation and successful h a t c h~n g during periods of submel-gence.KEY WORDS: Egg survi\~al Incubat~on . Larvae Hatchlng success . Tides T i m~n g of spawning .

Reducing error in reproductive timing caused by temperature variation: interspecific differences in behavioural adjustment by fiddler crabs

“…This timing results in the swift, night-time transport of larvae by tidal currents away from shallow waters where predators of larvae are most abundant (Morgan & Christy 1995, 1997, Hovel & Morgan 1997, Christy 2003. The timing of hatching is phenotypically plastic; females and even embryos that are transferred between tidal regimes adjust to local tidal conditions (Morgan 1996, Weaver & Salmon 2002, Christopher et al 2008.…”

“…While most other examples of changes in timing of mat ing in response to temperature are for seasonally breeding organisms, some fishes reproduce cyclically throughout the year and adjust mating timing with respect to temperature. As temperature de creases, these fishes either spawn earlier in the day so that larvae hatch at dusk, or, similar to U. terpsichores, spawn earlier in the tidal cycle to maintain timing of hatching during spring tides (Yamahira 1997, Kokita & Nakazono 2000, Asoh & Yoshikawa 2002.…”

Efecto de la acriflavina, formalina y glutaraldehído sobre la desinfección y la eclosión de los huevos del botete diana Sphoeroides annulatus

“…Tal es el caso de los huevos del botete diana, los cuales son demersales y adherentes y en el medio natural, los huevos fecundados se adhieren a diversos sustratos como rocas en la zona intermareal para su posterior desarrollo (Yamahira 1997, Duncan et al 2003b, Komar et al 2004, Chávez-Sánchez et al 2008, Abdo-de la Parra et al 2010. Aunque esta característica de adherencia de los huevos de botete diana, no representa un problema para la incubación en cultivos, ya que de acuerdo a Rodríguez-Ibarra et al (2010a), al eliminar esta capa a base de productos químicos y naturales se pueden obtener altos porcentajes de eclosión (96,2 ± 2,4%).…”

Is the timing of spawning in sparid fishes a response to sea temperature regimes?

“…Perhaps even more likely, spawning may be constrained to coincide with environmental conditions suitable for gametes, eggs or larvae, or targeted so that juveniles are produced at a time when conditions are suitable for survival and growth (Bye 1984;Norcross and Shaw 1984). For instance, spawning of the puVer, Takifugu niphobles, is timed to both accommodate the needs of developing embryos and to provide the conditions needed for successful hatching (Yamahira 1997). T. niphobles spawns intertidally, and developing embryos need day-time high tides to moderate temperature stress during intertidal incubation.…”