By Steven D. Mims, William L. Shelton
Paddlefish became of accelerating curiosity to the aquaculture neighborhood in recent times, quite as a possible new resource of seafood and caviar. local to North the US, paddlefish convey nice promise either regionally and across the world as a commercially attainable farmed species.
Paddlefish Aquaculture examines all points of the biology and tradition of those fish, exploring their body structure, creation, finish items and the economics underlying a profitable paddlefish operation. Chapters particularly disguise paddlefish biology, propagation and early tradition suggestions, construction for meat and caviar, overseas tradition and background, paddlefish nutrition items, bioaccumulants of contaminants in paddlefish, parasites and illnesses, and the economics of paddlefish aquaculture.
Paddlefish Aquaculture is a well timed functional reference for researchers and manufacturers attracted to paddlefish.
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Extra resources for Paddlefish aquaculture
Another general, but noticeable feature is the apparent scaleless, smooth exterior, which partially explains some of the common names given to paddlefish, such as one form or another of “catfish” and also its association with sharks. Although paddlefish are frequently described as “scaleless,” in fact they possess about five types of integumentary structures (Weisel 1975). Further, some degree of “roughness” develops during the prespawning period; this tends to be more pronounced in males, but also is sometimes present in females – these structures are commonly known as nuptial tubercles in other families of fishes.
8 Sensory (Eyes, Nares) Small eyes are laterally located near the base of the snout, just under the paired openings of the nares. Photoreception in the retina is dominated by large rods, with long, broad outer segments. Absorbance maxima of visual pigment in the rods are near 540 nm. In addition, the retina contains a large number of single cones with absorbance maxima of about 607 and 535 nm; 37% of photoreceptivity is by virtue of the cones. There is no indi cation of color acuity, but the cones are thought to contribute to contrast enhancement across the spectral range (Sillman et al.
Much less obvious are the two minute barbels (3–4 mm long) located on the underside of the snout just in front of the mouth. Interestingly, these are relatively much larger in larvae, being prominent in profile under the developing snout. Another general, but noticeable feature is the apparent scaleless, smooth exterior, which partially explains some of the common names given to paddlefish, such as one form or another of “catfish” and also its association with sharks. Although paddlefish are frequently described as “scaleless,” in fact they possess about five types of integumentary structures (Weisel 1975).