Dynamics of commercial size interval populations of female redclaw crayfish (Cherax quadricarinatus) reared in gravel-lined ponds: A stochastic approach

Estimating production costs of preadult redclaw crayfish,Cherax quadricarinatus, reared in a commercial nursery system: A stochastic bioeconomic approach

“…It has been suggested that HDPE membrane—lined ponds with aeration systems may improve water quality for redclaw crayfish cultivation. The increased flow that lined pond bottoms allow, when compared to soil or clay bottoms, and the relative ease of organic matter suspension (as it is not mixed with clay solids in the bottom), improves parameter management (Naranjo‐Páramo et al, ). This contributes to the reduction of ammonia and nitrite levels, possibly the consequence of the efficient action of increased numbers of hetero‐ and chemotrophic bacteria interacting with suspended organic matter.…”

“…At harvest, different age classes and a variety of sizes, including juveniles from early releases from some females, are collected. The dispersed size frequency distribution affects the economic viability of the production system by reducing the number of organisms that reach marketable size (Naranjo‐Páramo, Hernández‐Llamas, Vargas‐Mendieta, Mercier, & Villarreal, ).…”

“…On the other hand, more intensive techniques have been described as a way to improve rearing (see Garza de Yta, ; Jones, ; Masser & Rouse, ; Parnes & Sagi, ; Villarreal & Pelaez, ). In particular, Villarreal and Pelaez (), Naranjo‐Páramo et al (), Nuñez‐Amao et al (), and Naranjo‐Páramo et al () have referred to a three‐stage production system. Reproduction ponds are stocked with the broodstock at 3:1 female : male ratio and density of 1–3/m 2 .…”

“…Juveniles (2–3 g) are harvested daily from these ponds to be stocked and reared in nursery ponds until they reach 20–25 g. At harvest, the nursed preadults are divided to be stocked in monosex growout ponds, to be harvested at the desired marketable size. This is more efficient, as female and male growth rates will not decline in association with reproduction and the carrying capacity of the system is used more effectively to hold biomass that is intended for the market (Naranjo‐Páramo et al, ; Nuñez‐Amao et al, ).…”

Особенности роста десятиногих ракообразных в рециркуляционных установках на примере австралийского рака Cherax quadricarinatus (Decapoda: Parastacidae)

“…Каннибализм характерен для большинства видов декапод; это основной фактор, тормозящий интенсификацию технологий индустриальной аквакультуры ракообразных [8,12,13,17,28,30]. Другая проблема -снижение и неравномерность роста особей в группах с высокой плотностью содержания [21,25]. Изучение этих явлений и поиск решений, направленных на уменьшение их влияния, -одно из приоритетных направлений в аквакультуре ракообразных.…”