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Parachromis managuensis is a large species of cichlid native to freshwater habitats in Central America, where it is found from Honduras to Costa Rica. [2] The binomial name refers to Lake Managua in Nicaragua, from which the holotype was obtained. [3]
Gonochorism has evolved independently multiple times. [8] It is very evolutionarily stable in animals. [9] Its stability and advantages have received little attention. [10]: 46 Gonochorism owes its origin to the evolution of anisogamy, [11] but it is unclear if the evolution of anisogamy first led to hermaphroditism or gonochorism.
The relationship between anemonefish and their host sea anemones is not random and instead is highly nested in structure. [7] A. perideraion is a generalist, consistent with its widespread distribution, being hosted by the following four of the 10 host anemones: [ 2 ] [ 4 ] [ 7 ]
[7] Bivalvia are often gonochoric, meaning they have two distinct sexes, but some are protandric hermaphrodites meaning they can change genders throughout their growth. [5] The life stage of Anomia ephippium begins at the embryonic stage post fertilization. The embryos then develop into trochophore larvae, which are described to be free-swimming.
Yearlings of A. gueldenstaedtii (a) and P. spathula (d), and their hybrids: (b) typical LH (larger genome) hybrid, (c) typical SH (smaller genome) hybrid. [1]The sturddlefish is a hybrid of the American paddlefish (Polyodon spathula) and the Russian sturgeon (Acipenser gueldenstaedtii), accidentally created by researchers in 2019 and announced in 2020. [2]
The Cuban gar (Atractosteus tristoechus), also known as the manjuarí, is a fish in the family Lepisosteidae. [4] It is a tropical, freshwater species, although it also inhabits brackish water. [5] It is found in rivers and lakes of western Cuba and the Isla de la Juventud. [5] The flesh of the fish is edible, but the eggs are poisonous for ...
It is the most studied type of environmental sex determination (ESD). Some other conditions, e.g. density, pH, and environmental background color, are also observed to alter sex ratio, which could be classified either as temperature-dependent sex determination or temperature-dependent sex differentiation, depending on the involved mechanisms. [7]
A. polymnus (Saddleback anemonefish) is similar, but can be distinguished by its characteristic black or dark wedge shape on the tail. [2] There are reports of A. sabae being incorrectly labeled in the aquarium trade as A. clarkii, [4] [5] however the similarities are superficial in that, while a melanistic variation of A. clarkii has similar color, A. clarkii lacks the characteristic sloping ...