Collection and husbandry
Squid were captured by trawl in Vineyard Sound on two
occasions in 10–30 meters of water. Temperature in the area at
the time of capture was 16.7uC and 17.9uC, and salinity was 30.7
and 30.8, respectively (data from the 12 meter node at the
Martha’s Vineyard Coastal Observatory). These values are typical
for longfin squid recruits, which are primarily found in water
ranging from 6–35 m depth, 4–28uC, and with salinity of 30–37
between the spring and fall [29]. Similar to some other inshore
squid species, D. pealeii is able to tolerate temperature and salinity
variations [39]. Adults in healthy condition (free of cuts and
scrapes) were hand-selected from the group, gently placed in
individual buckets, and transported from the Marine Biological
Laboratory to a holding tank in the Environmental Systems
Laboratory (Woods Hole Oceanographic Institution, Woods Hole,
MA) within 1 hour of being caught. To encourage mating, more
females than males were selected from the trawl (f:m ratio; 6:2 and
16:3). The holding tank (120 cm diameter; 70 cm depth)
contained a layer of fine-grained sand at the bottom (,2 cm
thick). The sand was collected from a nearby beach and was rinsed
thoroughly with sand-filtered seawater prior to being added to the
holding tank. The holding tank was set up in a flow-through
system with sand-filtered seawater that was temperature-controlled
to ,20uC using aquarium heaters and chillers. In accordance with
our animal care protocols, squid were fed twice daily with live
Fundulus heteroclitus, which were gathered from a local bay.
Collection and husbandry
Squid were captured by trawl in Vineyard Sound on two
occasions in 10–30 meters of water. Temperature in the area at
the time of capture was 16.7uC and 17.9uC, and salinity was 30.7
and 30.8, respectively (data from the 12 meter node at the
Martha’s Vineyard Coastal Observatory). These values are typical
for longfin squid recruits, which are primarily found in water
ranging from 6–35 m depth, 4–28uC, and with salinity of 30–37
between the spring and fall [29]. Similar to some other inshore
squid species, D. pealeii is able to tolerate temperature and salinity
variations [39]. Adults in healthy condition (free of cuts and
scrapes) were hand-selected from the group, gently placed in
individual buckets, and transported from the Marine Biological
Laboratory to a holding tank in the Environmental Systems
Laboratory (Woods Hole Oceanographic Institution, Woods Hole,
MA) within 1 hour of being caught. To encourage mating, more
females than males were selected from the trawl (f:m ratio; 6:2 and
16:3). The holding tank (120 cm diameter; 70 cm depth)
contained a layer of fine-grained sand at the bottom (,2 cm
thick). The sand was collected from a nearby beach and was rinsed
thoroughly with sand-filtered seawater prior to being added to the
holding tank. The holding tank was set up in a flow-through
system with sand-filtered seawater that was temperature-controlled
to ,20uC using aquarium heaters and chillers. In accordance with
our animal care protocols, squid were fed twice daily with live
Fundulus heteroclitus, which were gathered from a local bay.
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