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Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming
Citation
Chuku, EO and Osei, IK, Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming, Journal of Fisheries and Coastal Management 2, 2, (1) pp. 34-40. ISSN 2676-2854 (2020) [Refereed Article]
Copyright Statement
© 2020. J. Fish Coast. Mgt., Department of Fisheries and Aquatic Sciences, University of Cape Coast.
DOI: doi:10.5455/jfcom.20200407063121
Abstract
The ability to accurately estimate the length of rope needed in the construction of stringed cultch masses for farming oysters without wastage is a major practical challenge. The problem arises mainly due to the illusive "ghost length" subsumed by knotting cultches on strings which potentially has dire financial implications for oyster farmers. Using repeated measures of rope diameter (D) and cultch thickness (T), we derived regression models for estimating subsumed rope length and further deduced an equation for determining the appropriate total rope length (L) for stringing cultches. For 2 mm, 4 mm and 6 mm diameter nylon ropes, the relationship between D and subsumed rope length for a single knot (Sk1) was Sk1 = - 0.34 + 12.25D [R2 = 0.9880; P = < 0.05]. Subsumed rope length for double-knotted cultch (Sk2) increased with increasing cultch thickness with a linear relationship Sk2 = 8.683 + 0.890T [R2 = 0.3871; P = 0.000]. Two equations were derived for estimating total rope length required to string a given number of cultches: 1) L = H + A + Nc(8.683 + 0.890T) for a 4 mm diameter nylon rope, and 2) L = H + A + Nc(24.50D + T - 0.68) for any rope diameter, where H is the desired distance between outermost cultches, A is the total allowance at both ends of the rope and Nc is the number of cultches. The models developed offer oyster farmers the opportunity to determine appropriate rope length for mass cultch preparations with minimal wastage of rope and consequently, save time and labour for readjustments of cultch set-ups.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | subsumed rope length, rope estimate, cultch construction, oyster farming, mangrove oyster |
| Research Division: | Agricultural, Veterinary and Food Sciences |
| Research Group: | Fisheries sciences |
| Research Field: | Aquaculture |
| Objective Division: | Animal Production and Animal Primary Products |
| Objective Group: | Fisheries - aquaculture |
| Objective Field: | Aquaculture oysters |
| UTAS Author: | Chuku, EO (Mr Ernest Chuku) |
| ID Code: | 153668 |
| Year Published: | 2020 |
| Deposited By: | Sustainable Marine Research Collaboration |
| Deposited On: | 2022-09-30 |
| Last Modified: | 2022-11-28 |
| Downloads: | 0 |
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