Amphioxus See Lancelet

Anadromy(-ous) Refers to fish whose adults leave the sea and ascend rivers to spawn most *salmon and *shads are anadromous. (See also Diadromy.) Analogous organs Organs whose similarity depends upon similarity of function, as in the wings of insects and *birds. Such structures are said to be analogous and to be analogues of each other.(Origin VT,p. 430). Analogous organs constrast with 'homologous' organs, derived from the same body parts, such as the wings of *bats and birds, both ultimately...

Diacope marginata See Snappers

Diadromy(-ous) Referring to regular, physiologically mediated migrations of certain stages of fish between fresh waters and the sea, and involving the majority of the members of a population (Myers 1949 McDowall 1988,1997). Diadromy has two basic forms, anadromy (as in *salmon), where spawning occurs in rivers, while the adults feed and grow in the sea, and catadromy (as in *eels), where spawning occurs in marine waters, and the adult stages feed and grow in rivers, lakes, and other freshwater...

Carcharias megalodon See Megatooth shark

Carp The common carp Cyprinus carpio (Linnaeus, 1758), one of the few fishes that are truly domesticated for aquaculture (Balon 1995a), a reason for their morphological variability. CD commented on this A *species may be highly variable, but distinct *races will not be formed, if from any cause selection be not applied. It would be difficult to select slight *variations in fishes from their place of habitation and though the carp is extremely variable and is much attended to in Germany, only...

Dajaus diemensis See Mullets

Damselfishes Fishes of the Family Pomacentri-dae, formerly a part of the *chromids, particularly abundant on coral reefs, to which they add their own tufts of colours, as flowers do to spring meadows. Some damselfish species actively 'farm' filamentous *algae as a food source, defending their meadows vigorously against competitors and even large predatory fishes (Zeller 1988). CD collected two species of this family during the voyage of the Beagle. The first was the Cape Verde gregory Stegastes...

Blennechis spp See Blennies

Blennies A group of closely related fishes of the Suborder Blennioidei, ofwhich the combtooth blennies, Family Blenniidae, are the most spe-ciose (see also FishBase). The shallow habitat of the blennies, which protects them from many potential predators (Gibson 1993) may be a cause for their marked 'sexual dimorphism, and 'territoriality, indicative of'sexual selection. Thus CD with some blennies, and in another allied genus,20 a crest is developed on the head of the male only during the...

Blennius spp See Blennies

Blyth, Edward English naturalist 1810-73 , based in India from 1841 to 1862, and who, during that period, responded to many of CD's queries on plants and animals. Blyth is much acknowledged as a source of information throughout Descent and Variations, notably on the variability of domestic mammals and birds, but also including carp Correspondence, Jan. 23, 1852 . In fact, he is one of the authors most cited by CD Sheets-Pyenson 1981 Tort 1996,p. 346 . Thus, it is difficult to accept the notion,...