| 31. | Scattered colonies of " Alcyonium digitatum " are occasionally present along with the hydroid " Bougainvillia muscus ".
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| 32. | It attaches to kelp, hard objects ( rocks, oil well rigs ) or invertebrates such as hydroids using byssal threads.
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| 33. | "Doto escatllari " was found associated with small hydroids of the family Sertulariidae; these are probably its prey.
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| 34. | In the sea mounts where the orange roughy is hunted, there were once sea fans, black corals, hydroids, invertebrates.
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| 35. | They remain attached to the hydroids or break off to be passively drifted away; in a few, the gonophores are naked.
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| 36. | It breeds in mid-winter, the eggs being laid amongst hydroid growths on the sea bed, and on stony ground.
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| 37. | These polyps develop over a few days into tiny 1 mm medusae, which are liberated and swim free from the parent hydroid colony.
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| 38. | The only character of " Calymperastrum " that does not occur in the Calastraceae is the presence of a leaf hydroid strand.
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| 39. | As a result, the hydroids have become one of the chief competitors of the commercial fish and may threaten their survival, Bollens said.
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| 40. | Each apparent individual " Velella velella " is in fact a hydroid colony, and most are less than about 7 cm long.
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