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J. Moll. Stud. (2001), 67, 475-482
© The Malacological Society of London 2001

OOGENESIS AND GONAD DEVELOPMENT IN THE COLD WATER LOLIGINID SQUID LOLIGO GAHI (CEPHALOPODA: MYOPSIDA) ON THE FALKLAND SHELF

V.V. LAPTIKHOVSKY and A.I. ARKHIPKIN*

Fisheries Department, Falkland Islands Government, P. O. Box 598, Stanley, Falkland Islands; * Corresponding author.

Email: fish.fig{at}horizon.co.fk

Oogenesis and gonad development were studied on histological sections of the ovaries of 12 females (98-165 mm mantle length, ML, I-V maturity stages) of the abundant Patagonian squid Loligo gahi sampled from the south-eastern part of the Falkland shelf. Additionally, reproductive systems of 136 females (80-300 mm ML, I-V maturity stages) were analysed microscopically to find atretic oocytes within the gonad. It was shown that the process of the oocyte development in the gonad and number of oogenetic stages in L. gahi are similar to those described before in a number of temperate loliginid species. However, development of both yolkless and vitellogenic oocytes in L. gahi is shifted to the earlier stages of the reproductive system maturation, giving probably more time for the yolk accumulation at low metabolic rates in cold water. Oocyte resorption was observed in the majority of mature females, but the proportion of atretic oocytes is always very low (about 1% of the total number of oocytes) showing a relative unimportance of this process in the L. gahi oogenesis.

(Received 10 December 2000; accepted 23 April 2001)


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