Loading...
Thumbnail Image
Publication

Reproduction, First Year Growth and Distribution of Anadromous Rainbow Smelt, <em>Osmerus mordax</em> (Mitchill), in the Paker River-Plum Island Sound Estuary, Massachusetts

Abstract
The reproductive biology of anadromous rainbow smelt, Osmerus mordax (Mitchill), in the Parker River-Plum Island Sound estuary was investigated during the fall 1974 and spring 1975. Only one set of maturing eggs was observed within the ovaries of fish examined; all ovarian locations matured at a similar rate. Larger fish produced larger ovaries and eggs but fewer eggs per gram of ovarian weight. Mean maturity indices for females and males during November through March increased 576.7% and 72.1%, respectively. Total fecundity ranged from 7,038 eggs for an age I, 127 mm female to 44,241 eggs for an age II, 204 mm specimen. Fecundity correlated highest with ovarian weight. In 1975 spawning commenced in the Parker River on 17 March and terminated in Cart Creek on 27 April; corresponding water temperatures were 4.0°C and 8.3°C, respectively. The mean egg densities for spawning sites in Cart Creek and the Mill River were 0.79 and 0.23 eggs/cm2 , respectively. A total egg population in Cart Creek of 1,772,492 ± 278,881 was estimated by a representative but disproportionate sampling technique. Spawning stock abundance was calculated from the egg population estimate. The influence of environmental factors upon spawning activity was examined with stepwise multiple regression; only one variable, tidal periodicity, was highly significant. Peaks of spawning activity corresponded with the bimonthly spring tides.
Type
openaccess
article
thesis
Date
Publisher
Rights
License
Research Projects
Organizational Units
Journal Issue
Embargo
Publisher Version
Embedded videos
Collections