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Full-Text Articles in Life Sciences
Responses Of The Hard Clam Mercenaria Mercenaria (Linne) To Induction Of Spawning By Serotonin., M.C. Gibbons, M. Castagna
Responses Of The Hard Clam Mercenaria Mercenaria (Linne) To Induction Of Spawning By Serotonin., M.C. Gibbons, M. Castagna
VIMS Articles
lam size, sex of clam, concentration of serotonin, and site of administration of serotonin were found to influence the mduction of spawning in the hard clam Mercenaria mercenaria (Linne). Overall, male clams greater than 36.4 mm thickness were ~ore likely_ to spawn in response to ser~ton~n i_njection at concentrations of 0.2 or 2.0-mM. Administration of serotonin by injection m the antenor adductor muscle resulted m sJgmficantly more spawnings than intragonadal injection or dispersal in water surrounding the incurrent siphon.
Seasonal Changes In The Depth Distribution Of Bivalve Larvae On The Southern New England Shelf, Roger L. Mann
Seasonal Changes In The Depth Distribution Of Bivalve Larvae On The Southern New England Shelf, Roger L. Mann
VIMS Articles
A limited survey was made of the seasonal change in occurrence, depth distribution, size distribution, and species composition of bivalve larvae at a single station on the southern New England shelf during the period April-December 1981. The data were related to temperature structure of the water column and chlorophyll a distribution. Bivalve larvae were most abundant during late August and September at depths greater than 10 m, in water temperatures of 14 to 18°C, and chlorophyll a concentrations of200 p.m length consisted predominantly of the species Modiolus modiolus (Linne), Arctica islandica (Linne) and Spisula solidissima (Dillwyn). Modiolus modiolus was present …
The Effect Of Various Levels Of Air-Supersaturated Seawater On Mercenaria Mercenaria (Linne), Mulinia Lateralis (Say), And Mya Arenaria Linne, With Reference To Gas-Bubble Disease, Robert Bisker, Michael Castagna
The Effect Of Various Levels Of Air-Supersaturated Seawater On Mercenaria Mercenaria (Linne), Mulinia Lateralis (Say), And Mya Arenaria Linne, With Reference To Gas-Bubble Disease, Robert Bisker, Michael Castagna
VIMS Articles
Supersaturated seawater was produced in a flow-through system by injecting air into a pressurized seawater line. Mercenaria mercenaria, Mulinia lateralis, and Mya arenaria were exposed to several different levels of supersaturated seawater at temperatures ranging from 5 to 17°C. Gas-bubble disease occurred at total gas saturation levels of 108% in juveniles of M. lateralis and 114% in juveniles of M. arenaria. Air blisters in the tissue, flotation, and mortality were observed at these levels. Reduced growth in juveniles of M. mercenaria was found at a total gas saturation level of 115%.
The Effects Of Seed Size, Shell Bags, Crab Traps, And Netting On The Survival Of The Northern Hard Clam Mercenaria Mercenaria (Linne), John N. Kraeuter, Michael Castagna
The Effects Of Seed Size, Shell Bags, Crab Traps, And Netting On The Survival Of The Northern Hard Clam Mercenaria Mercenaria (Linne), John N. Kraeuter, Michael Castagna
VIMS Articles
Seed size at planting is the dominant factor affecting hard clam survival to marketable size when field grow-out techniques are used. The use of plastic mesh nets, crab traps, and wire mesh bags (filled with oyster shells) alone or in combination can be used to increase survival of hard clams of ~ 6 to 8-mm shell height. These techniques do not provide sufficient protection for 2-mm seed. The combination of net + crab trap + shell bag was nearly twice as effective as the net alone when 10 to 14-mm seed was used and over five times as effective as …