Life Cycle and Mechanism of Abundance Fluctuations in Illex illecebrosus

The life cycle of the short fin squids of the North-west Atlantic, ranging in the area from the Florida Peninsula to Labrador as a single population (Romero and Amaratunga, 1981; Froerman, 1983; Froerman, Dubinina, 1984), was studied. The data on the distribution and biological parameters of the population in different ontogenetic stages was collected du-ring the 1966 to 1983 period. Information on the distribution and biology of the short fin squids inhabiting the areas south of Cape Hatteras and north of Banquerreau Bank was mainly adopted from the literary sources

Distribution and Peculiarities of Allometric Growth of Larval Illex in the Northwest Atlantic

The Illex larvae inhabit the epipelagial of the shelf waters, the continental slope and the Gulf Stream where the temperature and salinity range from 11.2 to 20.10°C and from 34.50 to 36.56%, respectively. The largest recorded aggregations were in the continental slope area of the Mid Atlantic Bight (MAB) between 35° and 38°N, and in the northern periphery of the Gulf Stream to 65°w. Illex illecebrosus spawn in the pelagial of the continentalslope between. the Florida Peninsula and 40°N. The spawning periodextends from September to May, with December-February as peak spawning months. Egg masses found in the spawning ground have a positive bouyancy

Reproductive Biology and Scale of Maturity Stage of Reproductive Systemof Female Squid (Illex illecebrosus)

Oogenesis and the development of the reproductive organs in Illex illecebrosus females was studied. The sample analyses were obtained from the area between Cape Hatteras and the Grand Bank in 1966-1983. To investigate the oogenesis, 10 gonads were taken from the females with the mantle length of 15-30 cm at allmaturity stages (except spawning). Approximately 2,000 specimens were studied to obtain knowledge of thedevelopment of the reproductive system organs during the ontogenesis. More than 50,000 females were sampled to analyse the maturation dynamics and the distribution during their life cycle. Data on the spawning andspent females were obtained for Illex argentinus

Scientiffic council meeting- June 1980 Effect of abiotic factors on distribution of young shortfin squids, illex illecebrosus (LeSueur, 1821)

The spatial distribution of shortfin squids in the area between the Gulf Stream and Nova Scotian shelf is analysed based on the data collected during the joint Soviet-Canadian cruise aboard the RTM "Belogorsk" in 1979. A detailed analysis of the hydrological data is made indicating a close correlation between the squid distribution and the structure of water masses in the area. Relationships between the squid distribution and oxygen minimum and temperature profile, as well as between the squid abundance and proportion (per cent) of the North Atlantic Central Water in the slope water masses are established. A method of estimating the young shortfin squid abundance in the given area based on T-S analysis of water masses is proposed. The hypothesis is suggested that larval squids are transported from the continental slope to the northern boundary of the Gulf Stream