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Temperature, salinity tolerance, and buoyancy during early development and starvation of Clyde and North Sea herring, cod, and flounder larvae
Yin, M.C.; Blaxter, J.H.S. (1987). Temperature, salinity tolerance, and buoyancy during early development and starvation of Clyde and North Sea herring, cod, and flounder larvae. J. Exp. Mar. Biol. Ecol. 107(3): 279-290. https://dx.doi.org/10.1016/0022-0981(87)90044-x
In: Journal of Experimental Marine Biology and Ecology. Elsevier: New York. ISSN 0022-0981; e-ISSN 1879-1697
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| Trefwoorden |
Buoyancy
Developmental stages > Larvae > Fish larvae
Environmental factors
Starvation
Tolerances
Marien/Kust |
| Auteurs | | Top |
- Yin, M.C.
- Blaxter, J.H.S.
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| Abstract |
Tolerance limits, at which 50% of larvae could survive high temperature and low salinity for 24 h, were determined for the yolk-sac larvae of Clyde and North Sea herring (Clupea harengus L.), cod (Gadus morhua L.) and flounder (Platichthys flesus L.) during early development and starvation. Clyde and North Sea herring, cod and flounder from hatching to the end of the yolk-sac stage, could withstand 21–23.5 °C, 20.5–23 °C, 15.5–18 °C and 21.5–24°C, respectively. The temperature tolerance was reduced by about 3.5–4 °C for Clyde herring and cod, 4–4.5 °C for North Sea herring and 8–8.5 °C for flounder when the larvae reached the point-of-no-return (PNR, when 50% of larvae, although still alive, are no longer strong enough to feed). The lowest salinity tolerance between hatching and the end of yolk-sac stage was 1–1.5‰ for Clyde and North Sea herring, 2–3‰ for cod and 0–1‰ for flounder. In no instance was there a loss of tolerance to low salinity during starvation. In fact, tolerance improved somewhat until the larvae became moribund. At hatching Clyde and North Sea herring larvae were negatively buoyant with a sinking rate of 0.35–0.4cm · s−1 which steadily decreased until the larvae became moribund. Cod and flounder larvae, however, were positively buoyant at hatching but became progressively less buoyant and, by the end of the yolk-sac stage they were negatively buoyant with a sinking rate of 0.06–0.07 cm · s−1. This sinking rate then decreased slightly until the PNR stage. The low salinity tolerance of all three species varied in a similar fashion to buoyancy |
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