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Embryonic and larval development of the brown wrasse Labrus merula (Pisces: Labridae)

Published online by Cambridge University Press:  04 April 2001

J. Dulčić
Affiliation:
Institute of Oceanography and Fisheries-Split, POB 500, 21000 Split, Croatia
V. Kožul
Affiliation:
Institute of Oceanography and Fisheries-Split, Biological Station Dubrovnik, POB 39, 20000 Dubrovnik, Croatia
M. Kraljević
Affiliation:
Institute of Oceanography and Fisheries-Split, POB 500, 21000 Split, Croatia
B. Skaramuca
Affiliation:
Institute of Oceanography and Fisheries-Split, Biological Station Dubrovnik, POB 39, 20000 Dubrovnik, Croatia
B. Glamuzina
Affiliation:
Institute of Oceanography and Fisheries-Split, Biological Station Dubrovnik, POB 39, 20000 Dubrovnik, Croatia
P. Ré
Affiliation:
Faculdade de Ciências da Universidade de Lisboa, Laboratório Maritimo da Guia, Cascais, Portugal

Abstract

In March 1997 one male and one female brown wrasse Labrus merula spawned spontaneously in aquaria conditions. Eggs were incubated at ambient temperature, salinity, oxygen and pH. The development of the eggs, yolk-sac larvae and larvae is described and illustrated with particular emphasis on features of practical value for identification of specimens from plankton. The ripe egg of brown wrasse is a typical labrid egg with a mean diameter of 0.93±0.05 mm. The incubation period was 106 h 45 min at a mean temperature of 14.3°C. Newly hatched yolk-sac larvae were 3.8±0.02 mm, while the yolk-sac was resorbed when larvae reached 4.68±0.15 mm in total length. Some characteristics which may be useful for identification are described and compared with some other labrid yolk-sac larvae and larvae. The length of newly hatched yolk-sac larvae of brown wrasse was significantly larger (t-test, P<0.05) than those of the other labrid species, but it is similar to that of Labrus bergylta. During the first 16 d (after resorption of yolk-sac) brown wrasse larvae does not possess a double crescent of melanophores on top of the head, but has a few melanophores on the anal fin which is very similar to the pigmentation of Symphodus (Crenilabrus) melops larvae, although there is a difference in length between them. Larvae older than 16 d have a double crescent of melanophores on the top of the head with melanophores on the anal fin-fold identical to L. bergylta larvae, but the difference in larvae length also exists.

Type
Research Article
Copyright
© 1999 Marine Biological Association of the United Kingdom

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