HORIZONTAL MIGRATION OF THE BLACK SEA SHRIMPS IN THE ODESSA BAY BEFORE AND AFTER SUNRISE
Journal Title: Naukovyi visnyk Chernivetskoho universytetu. Biolohiia (Biolohichni systemy) - Year 2014, Vol 6, Issue 2
Abstract
During the years 2011-2014 the character of the horizontal migration of the Black Sea shrimps in the Odessa Bay in the period before and after sunrise was studied. In 2011 three species of crustaceans: Crangon crangon, Palaemon elegans and Palaemon adspersus were observed. In subsequent years in the coastal zone only P. adspersus was detected. The nature of its horizontal migration was as follows: the maximum quantity indicators were observed in the coastal zone for 1 hour before sunrise. Then, around sunrise and after, the abundance and biomass of crustaceans were gradually decreased. In the spawning period the maximum quantity indicators of shrimps were also noted an hour before sunrise. In this time the number of oviparous females of P. adspersus was up to 92 % of the total number of crustaceans. Then, during sunrise and after, the number of oviparous females ranged at about an equal number of males, but 2 hours after sunrise was sharply reduced to 3,7 % of the total number of shrimps. In summer 2014 a sharp increase in quantitative parameters of shrimps was recorded. The maximum abundance (10071 ind.·100 m-2) and biomass (8056,8 g·100 m-2) of P. adspersus were marked by an hour before sunrise. Then, these figures were gradually declining, and within 2 hours after sunrise the abundance of shrimps was 1019 ind.·100 m-2, and biomass – 550,3 g·100 m-2. The length of P. adspersus was ranged from 17,1 to 65,6 mm. The dynamics of the size structure of shrimps in all years studied was of a similar character. So, an hour before sunrise in the coastal area was mainly attended by adult animals. Then, closer to sunrise the young individuals were appeared, and the number of adults gradually decreased. Two hours after sunrise in the coastal zone only juveniles were remained.
Authors and Affiliations
А. Ю. ВАРИГИН
Keywords
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HORIZONTAL MIGRATION OF THE BLACK SEA SHRIMPS IN THE ODESSA BAY BEFORE AND AFTER SUNRISE
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