Observations on the paralarval ecology of a euryhaline squid Lolliguncula brevis (Cephalopoda: Loliginidae)

Publication Type:Journal Article
Year of Publication:1991
Authors:M. Vecchione
Journal:Fishery Bulletin
Date Published:1991///
Keywords:Cephalopod, Ecology, Lolliguncula, squid

Cephalopods were examined from more than 3000 zooplankton samples collected over a two-year period from coastal and estuarine waters of southwest Louisiana. In total, 270 cephalopods were taken in 164 of these samples; 267 specimens from 161 samples were Lolliguncula brevis. They were found in coastal waters from April through January, but in estuarine waters only in May, July, and August. Maximum standardized abundance was found in the nearbottom waters of the estuary in May. Overall, paralarval L. brevis were most often collected nearbottom in inshore coastal waters during May-June. This species was not collected in the estuary at salinities below 27 x 10(-3). Although they were found in coastal waters with lower salinities (22 x 10(-3), abundance was generally greatest in waters with salinities of about 26 x 10(-3). Somewhat surprisingly, paralarval L. brevis were collected throughout the range of dissolved oxygen concentrations sampled, including waters considered to be hypoxic, with < 2 mL/L dissolved oxygen. Contents of the digestive tract were examined in 50 paralarvae; 18% of these contained solid food while others were inflated with a semiliquid mush or clear liquid.

Alternate Journal:Fish.Bull.
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