Age Estimation of Sea Scallop Larvae (Placopecten magellanicus) from Daily Growth Lines on Shells
نویسندگان
چکیده
منابع مشابه
Effects of sex steroids on spawning in the sea scallop, Placopecten magellanicus
Sex steroids have long been known to exist in molluscs, but few studies have focused on the roles of these substances in molluscan reproduction. In this study, we demonstrate that injections of estradiol into ripe sea scallops induced spawning in both sexes, testosterone injections induced spawning in males only and progesterone blocked spawning in both sexes. We also show that injections of se...
متن کاملEffects of sex steroids on gonadal development and gender determination in the sea scallop, Placopecten magellanicus
Previous work has demonstrated the presence of various sex steroids in molluscs and suggested their possible functions in the control of reproduction. However, their potential roles in early sexual development have remained unexplored. The results of the present study showed that injections of estradiol, testosterone, progesterone, and dehydroepiandrosterone (DHEA) all accelerated gonadal diffe...
متن کاملPostingestive selection in the sea scallop, Placopecten magellanicus (Gmelin): the role of particle size and density.
Suspension-feeding bivalves can influence the energy value of their food supply by particle selection at various stages from particle clearance to production of feces. Previous workers have found that some bivalve species (Mercenaria mercenaria, Mytilus edulis) are capable of postingestive selection within the stomach. Few studies, however, have attempted to isolate the factors that influence p...
متن کاملOceanographic variation influences spatial genomic structure in the sea scallop, Placopecten magellanicus
Environmental factors can influence diversity and population structure in marine species and accurate understanding of this influence can both improve fisheries management and help predict responses to environmental change. We used 7163 SNPs derived from restriction site-associated DNA sequencing genotyped in 245 individuals of the economically important sea scallop, Placopecten magellanicus, t...
متن کاملNucleotide sequence of the 18S ribosomal RNA gene from the Atlantic sea scallop Placopecten magellanicus (Gmelin, 1791).
The Atlantic sea scallop, Placopecten magellanicus, is a bivalve mollusc that occurs along the Atlantic seaboard of North America. It is commercially exploited and in many areas has sustained an important fishery for more than 60 years (1). Recently it has been targeted as a potential species for aquaculture (2). The 18S rRNA sequence presented below represents the first complete molluscan sequ...
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ژورنال
عنوان ژورنال: Journal of Northwest Atlantic Fishery Science
سال: 1987
ISSN: 0250-6408,1682-9786,1811-8224
DOI: 10.2960/j.v7.a14