||Relationships between Maternal Size, Egg Diameter, Time of Spawning Season, Temperature, and Length at Hatch of Atlantic Silverside, 'Menidia menidia'.
Bengtson, D. A. ;
Barkman, R. C. ;
Berry, W. J. ;
||Rhode Island Univ., Kingston. Dept. of Food Science and Technology. ;Springfield Coll., MA. Dept. of Biology.;Environmental Research Lab., Narragansett, RI.
||EPA/600/J-87/498 ; ERLN-633
Marine biology ;
Marine fishes ;
North Atlantic Ocean ;
Menidia menidia ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Eggs were stripped from gravid Atlantic silversides collected on two occasions, once during the early part and once during the late part of the natural spawning season. Unfertilized egg diameter was not correlated with length of the female, nor was it significantly larger during the early part of the season. Eggs were fertilized and incubated in the laboratory. Larval length at hatch was measured every 24 h during the hatching period after embryos were incubated at 18 or 25C. In most cases (17 out of 20 at 25C, 10 out of 20 at 18C), there was a significant decrease in length at hatch during the hatching period for a given female's eggs incubated at a given temperature. In the natural environment, larvae hatched early in the season under cooler temperatures could average 12% longer than those hatched later under warmer temperatures, and therefore may have a greater chance of survival.