Site pages
Current course
Participants
General
Topic 1
Topic 2
Topic 3
Topic 4
Topic 5
Topic 6
Topic 7
Topic 8
Topic 9
Topic 10
Topic 11
Topic 12
Topic 13
Topic 14
Topic 15
Topic 16
Topic 17
Topic 18
Topic 19
Topic 20
Topic 21
Topic 22
Topic 23
Topic 24
Topic 25
Topic 26
Topic 27
Topic 28
Topic 29
2.1.4. Fish growth in tropical and temperate waters
2.1.4. Fish growth in tropical and temperate waters
Fishes in temperate waters live long compared to those in warmer regions. The growth coefficient, natural mortality are generally higher in tropical waters compared to temperate waters. Fish tend to mature according to a fixed portion to their asymptotic size (L ¥ ). Larger the asymptotic size, larger is also the size at first maturity. Hence for a given family of fish Lm/L ¥ is a constant ratio (Cushing, 1965). The asymptotic length and minimum maturity are generally higher in fishes of temperate waters. Because these two parameters are at higher side, it could be said Lm/L ¥ is inversely related to M/K. This is due to the inverse relation between K and L ¥ .
In elasmobranch fishes of tropical waters, unlike teleosts grow slowly, live long and attain very large size. In general, elasmobranchs have long life with slow growth rate; the reproductive rate is also high with low reproductive stress.