E-ISSN 2676-2862 | ISSN 2676-2854
 

Short Communication 


Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming

Ernest Obeng Chuku, Isaac Osei.

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.

Key words: Subsumed rope length, Rope estimate, Cultch construction, Oyster farming, Mangrove oyster


 
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How to Cite this Article
Pubmed Style

Chuku EO, Osei I. Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming. J. Fish. Coast. Mgt. 2020; 2(1): 34-40. doi:10.5455/jfcom.20200407063121


Web Style

Chuku EO, Osei I. Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming. http://www.jfcomonline.com/?mno=91312 [Access: January 31, 2021]. doi:10.5455/jfcom.20200407063121


AMA (American Medical Association) Style

Chuku EO, Osei I. Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming. J. Fish. Coast. Mgt. 2020; 2(1): 34-40. doi:10.5455/jfcom.20200407063121



Vancouver/ICMJE Style

Chuku EO, Osei I. Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming. J. Fish. Coast. Mgt. (2020), [cited January 31, 2021]; 2(1): 34-40. doi:10.5455/jfcom.20200407063121



Harvard Style

Chuku, E. O. & Osei, . I. (2020) Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming. J. Fish. Coast. Mgt, 2 (1), 34-40. doi:10.5455/jfcom.20200407063121



Turabian Style

Chuku, Ernest Obeng, and Isaac Osei. 2020. Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming. Journal of Fisheries and Coastal Management, 2 (1), 34-40. doi:10.5455/jfcom.20200407063121



Chicago Style

Chuku, Ernest Obeng, and Isaac Osei. "Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming." Journal of Fisheries and Coastal Management 2 (2020), 34-40. doi:10.5455/jfcom.20200407063121



MLA (The Modern Language Association) Style

Chuku, Ernest Obeng, and Isaac Osei. "Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming." Journal of Fisheries and Coastal Management 2.1 (2020), 34-40. Print. doi:10.5455/jfcom.20200407063121



APA (American Psychological Association) Style

Chuku, E. O. & Osei, . I. (2020) Estimating accurate rope length to minimize wastage in cultch construction for mangrove oyster farming. Journal of Fisheries and Coastal Management, 2 (1), 34-40. doi:10.5455/jfcom.20200407063121