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Temperature effects on the embryonic development and hatching success of the squid Loligo vulgaris reynaudii

Authors: Oosthuizen, Ané; Roberts, Mike J.; Sauer, Warwick H. H.

Source: Bulletin of Marine Science, Volume 71, Number 2, September 2002 , pp. 619-632(14)

Publisher: University of Miami - Rosenstiel School of Marine and Atmospheric Science

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Abstract:

The squid Loligo vulgaris reynaudii spawns in two environmentally different areas, shallow (<60 m) inshore bays and in deeper (60–120 m) waters on the mid-continental shelf off the south east coast of South Africa. The temperature regimes between these two spawning environments are variable. The effects of temperature on the embryonic development of L. v. reynaudii were investigated at both stable and fluctuating laboratory temperatures and natural fluctuating conditions. The relationship between embryonic development time and water temperature was defined by a polynomial regression function. Embryonic development time decreased with increasing temperature. An optimum temperature range for development was identified between 12 °C and ∼17 °C, at which development took 50.1 and ∼26.6 d, respectively. Outside the optimal temperature range (9 °C and 21 °C) abnormal embryonic development occurred. Fluctuating temperature experiments were based on inshore temperature data collected over 7 yrs. The early development stages were more sensitive to variable temperature regimes than later development stages. Embryonic development under laboratory and natural conditions was similar. Natural upwelling events in the inshore spawning areas had a negligible effect on the development success of eggs in these areas.

Document Type: Research Article

Publication date: September 1, 2002

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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